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Shabbos

Rav Dovid gives a daily halacha at the Wall Street Synagogue in Lower Manhattan.
This series covers the 39 Melachos of Shabbos, Shabbos prayers, and more.
16 Kislev 5771 listen The Earliest Time to Light on Motzei Shabbos (15:35)
On Motzei Shabbos, the proper time to light is immediately after havdalah.
Sources: Igros Moshe OC 4:62; Ran Shabbos 9a d.h. "Mitzvatah mi'she-tishka"
15 Kislev 5771 listen The Earliest Time to Light on Erev Shabbos (13:02)
Understanding Rav Moshe's chiddush in the time for Chanukah candles on Erev Shabbos.
Sources: Igros Moshe OC 4:62; Ran Shabbos 9a d.h. "Mitzvatah mi'she-tishka"
11 Kislev 5771 listen Erev Shabbos: Chanukah Candles Immediately Prior to Shabbos Candles (15:01)
Rav Moshe's chiddush: on Shabbos Chanukah: light Chanukah candles immediately prior to Shabbos candles.
Sources: Igros Moshe OC 4:62
10 Kislev 5771 listen Lighting Chanukah Candles Early on Fridays (15:50)
On Erev Shabbos, the time for lighting Chanukah candles is fixed by the onset of Shabbos, not by nightfall.
Sources: Igros Moshe OC 4:62
9 Kislev 5771 listen Shkiya and Chanukah Candles (15:09)
"Sunset" is the time for lighting Chanukah candles. But when is sunset?
Sources: OC 679:1; OC 672:1; MB 672:1, Beur Halacha d.h. "Im sof skiyata"; Igros Moshe OC 4:62
28 Tishrei 5771 listen Gozez: Dealing with Hangnails (15:35)
Hangnails, scabs, and trimming nails for the mikveh.
Sources: Ch"A Hil. Shabbos 21:4-6
27 Tishrei 5771 listen Aspects of Shearing (14:25)
Plucking feathers, trimming nails.
Sources: Ch"A Hil. Shabbos 21:2-4
26 Tishrei 5771 listen Gozez: Introduction to Shearing (10:10)
The shearing of wool is the first step toward making cloth.
Sources: Ch"A Hil. Shabbos 21:1
6 Tamuz 5770 listen What time does shabbos end? (16:51)
Based on the gaonim, Rav Moshe allows certain leniencies on motzei shabbos as well.
Sources: Igros Moshe OC 4:62
4 Tamuz 5770 listen Applying Rabbeinu Tam (16:44)
Based on Rabbeinu Tam, Rav Moshe allows certain leniencies for emergency situations.
Sources: Igros Moshe OC 4:62
3 Tamuz 5770 listen Why are Malachos d'Rabbanan allowed during Ben HaShmashos? (15:47)
Rav Moshe explains the reason behind leniencies -- or lack of stringencies -- ben hashmashos.
Sources: Igros Moshe OC 4:62
27 Sivan 5770 listen Malacho d'Rabbanan Ben HaShmashos (14:57)
D'Rabbanan is permitted during twilight under certain circumstances.
Sources: Aruch HaShulchan OC 261:13-14
26 Sivan 5770 listen Malachos During Ben HaShmashos (17:07)
What activities are prohibited and what permitted during twilight?
Sources: Aruch HaShulchan OC 261:11-12,14,17
25 Sivan 5770 listen What time does Shabbos end? (2) (16:21)
The proper end time for shabbos according to Rav Moshe -- conclusion. Introduction to Ben HaShmashot.
Sources: Igros Moshe OC 4:62; Aruch HaShulchan OC 261:11
22 Sivan 5770 listen What time does Shabbos end? (16:18)
The proper end time for shabbos according to Rav Moshe.
Sources: Igros Moshe OC 4:62
20 Sivan 5770 listen Ben HaShmashos by the Aruch HaShulchan (14:37)
The Aruch HaShulchan puts it all together and concludes that we should start shabbos 18 minutes before sunset.
Sources: Aruch HaShulchan OC 261:7-8
19 Sivan 5770 listen Ben HaShmashos by Sefer HaYeraim (15:53)
Rabbi Eliezer of Mitz concludes that Ben HaShmashos begins some 18 minutes before sunset.
Sources: Aruch HaShulchan OC 261:6
15 Sivan 5770 listen Ben HaShmashos: Understanding Rabbeinu Tam (16:17)
So how is it that Rabbeinu Tam concludes that sunset is so late!?
Sources: Aruch HaShulchan OC 261:5
14 Sivan 5770 listen Ben HaShmashos by the Rambam (17:21)
The Aruch HaShulchan questions the Rambam's approach to Ben HaShmashos and learns much from his answers.
Sources: Aruch HaShulchan OC 261:4
13 Sivan 5770 listen Just when (or what) is "shkiya"? (14:20)
Is shkiya what we commonly call "sunset"... or is it something else?
Sources: Aruch HaShulchan OC 261:1-3
12 Sivan 5770 listen Ben HaShmashos by the Mishna Brura (15:45)
The Mishna Brura provides a summary overview of the determination of the onset of shabbos.
Sources: MB 261:23
11 Sivan 5770 listen Ben HaShmashos by the Gra (15:51)
By the Vilna Gaon (and others), sunset is not the onset of nightfall; that begins about 58 minutes later with ben hashmashos.
Sources: OC 261:2; MB 261:23
8 Sivan 5770 listen Ben HaShmashos by Rabbeinu Tam (17:32)
The latest possible time for sunset is that of Rabbeinu Tam. When is it and why?
Sources: OC 261:2; MB 261:19-21
5 Sivan 5770 listen Introduction to "Ben HaShmashos" (15:43)
Understanding "Ben HaShmashos" is essential for understanding when shabbos starts.
Sources: Igros Moshe OC 4:62
4 Sivan 5770 listen When does Shabbos start? (17:24)
This introduction to the question of when shabbos starts begins with a philosophy of halacha itself.
Sources: Igros Moshe OC 4:62
29 Iyar 5770 listen Hatmana: A Pot within a Pot (11:43)
Warming a baby bottle on shabbos; beating eggs and vigorous mixing.
Sources: Ch"A Hil. Shabbos 2:8-9, 20:21
28 Iyar 5770 listen Hatmana by Night; Hatmana by Day (16:39)
The halachot of hatmana vary depending on whether the food is to be kept warm for the night meal or the day meal.
Sources: Ch"A Hil. Shabbos 2:5-7, 20:22
27 Iyar 5770 listen Hatmana: Crockpots and Hot Water (16:51)
Actual hatmana involves heat and insulation.
Sources: Ch"A Hil. Shabbos 2:5
26 Iyar 5770 listen Hatmana Gufa: Insulating on Erev Shabbos (16:14)
Food cannot be left on erev shabbos wrapped up with something that will continue to add heat.
Sources: Ch"A Hil. Shabbos 2:5
24 Iyar 5770 listen Hatmana: Amira l'Akum (16:57)
Food cooked by a non-Jew for a Jew; water heated for a Jew by a non-Jew.
Sources: Ch"A Hil. Shabbos 20:17-18
23 Iyar 5770 listen Hatmana: Food Warmed by a Non-Jew (17:57)
...and can you ask a non-Jew to warm food? What if he already did it?
Sources: Ch"A Hil. Shabbos 20:15-16
21 Iyar 5770 listen Hatmana: Removing the Pot from the Stove (16:24)
Psik reisha; work done by a non-Jew on shabbos; a "shabbos oven."
Sources: Ch"A Hil. Shabbos 2:4
20 Iyar 5770 listen Hatmana: Shogeg and Meizid (16:34)
If one violates the gezeira of hatmana, is the food permitted or forbidden?
Sources: Ch"A Hil. Shabbos 2:3
19 Iyar 5770 listen Hatmana: Food on an Open Flame (13:07)
Three different categories of foods can be left on an open flame going into Shabbos.
Sources: Ch"A Hil. Shabbos 2:3
16 Iyar 5770 listen Hatmana: Lest We Stoke the Coals (10:52)
One of the main halachic aspects of leaving food to be warm on shabbos is the concern that we will stoke the coals.
Sources: Ch"A Hil. Shabbos 2:2-3
15 Iyar 5770 listen Introduction to Hatmana (17:34)
Malachos that can be started prior to shabbos.
Sources: Ch"A Hil. Shabbos 2:1
8 Adar 5770 listen Birkat HaMazon on Motzei Shabbos when Sunday is Purim (16:30)
When Sunday is Rosh Chodesh, we say both retzei and ya'aleh v'yavo in birkat hamazon as shabbos ends. What about when Sunday is Purim?
Sources: OC 187:4; OC 188:10; MB 188:33
17 Shevat 5770 listen Bishul: Washing Dishes and Warming (16:23)
When washing dishes, one must be careful not to cook.
Sources: Ch"A Hil. Shabbos 20:19-20
7 Shevat 5770 listen Bishul: Warming and Insulating (18:48)
Warming food; returning food to or placing food into an insulated place.
Sources: Ch"A Hil. Shabbos 20:14
6 Shevat 5770 listen Bishul: Returning or Warming Food Near the Oven (8:29)
Returning food or warming food near the oven may or may not require a blech, depending on the exact circumstances.
Sources: Ch"A Hil. Shabbos 20:13
5 Shevat 5770 listen Bishul: Blech (15:00)
Using a blech on top or inside of an oven.
Sources: Ch"A Hil. Shabbos 20:12
4 Shevat 5770 listen Bishul: One Pot on Top of Another (17:58)
Making a blech on shabbos; placing one pot on top of another.
Sources: Ch"A Hil. Shabbos 20:11
29 Tevet 5770 listen Bishul: Warming Water (10:51)
Can water be placed near the stove to warm up?
Sources: Ch"A Hil. Shabbos 20:11
26 Tevet 5770 listen Bishul: Roasting after Cooking (17:58)
While there is no "cooking after cooking," there is "roasting after cooking," "cooking after baking," etc.
Sources: Ch"A Hil. Shabbos 20:10
21 Tevet 5770 listen Bishul: Mixing and Serving (15:30)
Can you mix a pot on shabbos? What about serving from the pot?
Sources: Ch"A Hil. Shabbos 20:9
19 Tevet 5770 listen Bishul: Tea, Ladles, Dissolving, and Melting (2) (16:59)
Is dissolving or melting considered to be "cooking"?
Sources: Ch"A Hil. Shabbos 20:7
18 Tevet 5770 listen Bishul Tea, Ladles, Melting, and Dissolving (16:22)
Applications of kli sheini: making tea; using a ladle. Introduction to melting and dissolving.
Sources: Ch"A Hil. Shabbos 20:7
13 Tevet 5770 listen Bishul: Cooking in Hot Soup (14:57)
Soaking cooked foods in hot water; pouring hot water on cooked foods.
Sources: Ch"A Hil. Shabbos 20:6
12 Tevet 5770 listen Bishul: A Secondary Vessel (2) (15:50)
Secondary vessels and solid items.
Sources: Ch"A Hil. Shabbos 20:4-5
11 Tevet 5770 listen Bishul: A Secondary Vessel (1) (15:12)
Cooking in a secondary vessel.
Sources: Ch"A Hil. Shabbos 20:4
7 Tevet 5770 listen Bishul: Pouring from a Primary Vessel (2) (14:41)
The details of pouring from a primary vessel.
Sources: Ch"A Hil. Shabbos 20:3
5 Tevet 5770 listen Bishul: Cooking in a Primary Vessel; Pouring from a Primary Vessel (1) (15:05)
Pouring from a cooking vessel isn't quite cooking, but...
Sources: Ch"A Hil. Shabbos 20:3
4 Tevet 5770 listen Bishul: Cooking from Secondary Heat Sources (14:38)
Cooking on shabbos with toldot ha-or -- secondary heat sources -- is a d'oraita prohibition.
Sources: Ch"A Hil. Shabbos 20:2
14 Kislev 5770 listen Bishul: Recooking (14:17)
If a food is already fully cooked, does placing it on the heat constitute cooking? Or in other words, is there a malacha involved in "recooking"? (Bishul Achar Bishul)
Sources: Ch"A Hil. Shabbos 20:8
13 Kislev 5770 listen Bishul: Introduction to Cooking (12:41)
The source and principle of the malacha of .
Sources: Ch"A Hil. Shabbos 20:1
25 Iyar 5769 listen Losh: Halacha l'Ma'aseh (17:24)
Practical applications of kneading on shabbos: baby foods and bottles, tuna and egg salad, sandboxes, guacamole, cholent, and more.
Sources: Ch"A Hil. Shabbos 19:5-6
21 Iyar 5769 listen Losh: Mixing Instant Cereal (16:53)
All kinds of mixing falls under the malacha of losh.
Sources: Ch"A Hil. Shabbos 19:3-4
L'ilui nishmat Zissel Devorah bas Avraham Abish on the occasion of her yahrzeit.
17 Iyar 5769 listen Losh: Mixing Mustard and Horseradish (15:04)
Kneading includes mixing a thick paste.
Sources: Ch"A Hil. Shabbos 19:2
14 Iyar 5769 listen The Parameters of Kneading (15:52)
Halacha l'ma'aseh: when is one chayav for kneading?
Sources: Ch"A Hil. Shabbos 19:1
13 Iyar 5769 listen Introduction to Kneading (Losh) (14:57)
The Av Malacha and principles of losh (kneading).
Sources: Shabb. 18a
12 Iyar 5769 listen What is a medical emergency? (2) (14:51)
Situations that may involve danger to life or that don't yet involve danger to life are also considered medical emergencies for shabbos purposes.
Sources: Shmiras Shabbos K'Hilchosa 32:11:10-15, 32:12-17
11 Iyar 5769 listen What is a medical emergency? (1) (16:49)
The halachic definition of a "medical emergency" are broader than we might expect.
Sources: Shmiras Shabbos K'Hilchosa 32:11:1-9
10 Iyar 5769 listen Medical Emergencies: Respected Rabbis Should be First to Violate Shabbos (17:44)
When an emergency exists, the most learned scholars should be first in line to tend to it -- in order to emphasize the importance of pikuach nefesh over shabbos and the value of life.
Sources: OC 328:11; MB 328:34-35
7 Iyar 5769 listen Alacrity in Responding to a Medical Emergency (15:44)
When it comes to life-threatening illness, we act quickly until all doubt is resolved.
Sources: OC 328:10,15; MB 328:25-28,40-42; Beur Halacha d.h. "V'Yeish Schar Harbeh"
6 Iyar 5769 listen Differentiating Emergencies from Non-Emergencies (11:12)
Treatment before and after determining the nature of the emergency.
Sources: OC 328:4; MB 328:15-16
5 Iyar 5769 listen Emergency and Non-Emergency Treatment (15:21)
In emergencies, we don't hesitate to break shabbos; non-emergency treatment, however, is in a different category.
Sources: OC 328:4; MB 328:13-14
30 Nissan 5769 listen Foolish Piety in a Medical Emergency (14:38)
In a medical emergency, only a fool stops to ask questions about violating shabbos.
Sources: OC 328:2; MB 328:6
29 Nissan 5769 listen Medical Situations on Shabbos - Introduction (12:18)
An introduction to handling medical conditions and health issues on Shabbos.
Sources: OC 328:2; MB 328:4-5
27 Nissan 5769 listen Rosh Chodesh that Falls on Shabbos (14:10)
When Rosh Chodesh falls on Shabbos, we have a special haftarah and a special musaf.
Sources: OC 425:1,3; MB 425:1-2,14-15
21 Av 5768 listen Meraked (2): Sifters vs. Shakers (15:28)
Salt shakers, sugar shakers, drain filters, tea bags, and coffee presses.
Sources: Ch"A Hil. Shabbos 18:3
Dedicated as a zechut for a refuah shleimah for Moshe Chaim ben Rivka.
20 Av 5768 listen Meraked: Sifting on Shabbos (15:50)
Principles, parameters, and examples of the malacha of tochen on shabbos.
Sources: Ch"A Hil. Shabbos 18:1-2
Dedicated as a zechut for a refuah shleimah for Moshe Chaim ben Rivka.
14 Av 5768 listen Tochen: Conclusion and Summary (15:06)
Final issues and examples in tochen; summary of all tochen principles.
Sources: Ch"A Hil. Shabbos 17:5-7
13 Av 5768 listen Principles of Tochen: Items Grown from the Ground; Ain tochen achar tochen (15:26)
Tochen only applies to items that grow from the ground. But what exactly grows from the ground?
Sources: Ch"A Hil. Shabbos 17:4; Brachot 6:3
12 Av 5768 listen Principles of Tochen: Utensils Used for Grinding (16:22)
The impact of a grinder or grater with regard to tochen as a malacha.
Sources: Ch"A Hil. Shabbos 17:3
11 Av 5768 listen Tochen: Cutting and Chopping (15:42)
One of the most common applications of tochen is the cutting or chopping of vegetables for salad.
Sources: Ch"A Hil. Shabbos 17:2
10 Av 5768 listen Introduction to Tochen / Grinding (15:09)
The principles and parameters of the malacha of tochen on shabbos; permitted ways of grinding.
Sources: Ch"A Hil. Shabbos 17:1
5 Av 5768 listen Tisha b'Av that Falls on Sunday: Overview and Summary (15:23)
Summary and overview of all the special aspects of Shabbos Erev Tisha b'Av.
Sources: Ch"A 135:23
4 Av 5768 listen Havdala on Motzei Shabbos Erev Tisha b'Av (15:22)
On motzei shabbos erev Tisha b'Av, we cannot drink wine. How do we make havdala?
Sources: OC 556; MB 556:1-5
3 Av 5768 listen Maariv on Motzei Shabbos Erev Tisha b'Av (14:57)
Sources: OC 559:1-2; MB 559:1-9
29 Tamuz 5768 listen Shabbos Erev Tisha b'Av: Shalshudos and Maariv (16:05)
On Shabbos, the third meal usual extends past sunset into the night; on Erev Tisha b'Av, we begin fasting at sunset. So what do we do when Erev Tisha b'Av falls on Shabbos?
Sources: OC 552:10;553:2; MB 552:23-24;553:6-7
28 Tamuz 5768 listen Shabbos Erev Tisha b'Av: Meat, Wine, Learning Torah, and Tz"Tz (14:51)
Sources: OC 551:9;553:2,12; MB 553:8-10,12
27 Tamuz 5768 listen Laundry, Haircuts, and Washing for the Shabbos before Tisha b'Av (15:34)
In general, we don't launder or wear clean clothes, take haircuts, or wash during the nine days. What about lichvod shabbat?
Sources: OC 551:3,16; MB 551:32,95-97
26 Tamuz 5768 listen Shabbos Rosh Chodesh Menachem Av (13:20)
On Shabbos Rosh Chodesh Menachem Av, do we read the haftarah for Rosh Chodesh or for the Tlat d'Puranuta? Also: the brachot for the haftorah and musaf on Shabbos Rosh Chodesh.
Sources: OC 425:1-3; MB 425:8,15; OC 284:2; MB 284:4; OC 428:8
20 Sivan 5768 Next Class: Tying and Untying
Knots.
Sources: Source Sheet
16 Sivan 5768 listen Becoming a Chasid for Brachos; The Importance of Wine and Fruit (11:58)
Why does wine get a special bracha? Why does fruit from a tree get a different bracha from other plants?
Sources: Shaarei Teshuva 202:19; OC 202:1; MB 202:1-2
3 Sivan 5768 listen Havdala following Yom Tov (15:13)
We make havdala following Yom Tov, but we don't include the candle or spices. Why?
Sources: OC 491:1; MB 491:1-2; OC 298:1; MB 298:1
29 Iyar 5768 listen A Practical Guide to Shabbos (9): Combing, Dyeing, Spinning, and Weaving (37:11)
Malachot dealing with thread and cloth on shabbos.
Sources: Source Sheet
24 Iyar 5768 listen The Age of Chinuch; the Age of Understanding (15:16)
Chinuch for mitzvot lo ta'aseh begins as soon as the child understands "no." We protect our children from physical dangers; should we not be equally careful of spiritual dangers?
Sources: OC 343:1; MB 343:3,7-8
23 Iyar 5768 listen Allowing a Child to Violate an Issur (15:41)
A child picks up a forbidden food or begins to perform a forbidden act. Need we stop the child? Reprimand him or her? What if it isn't your child?
Sources: OC 343:1; MB 343:1-3
Dedicated for a refuah shleimah for Chaya Sarah Dinah bas Alta Bas Sheva
22 Iyar 5768 listen Giving a Child an Issur (15:22)
Under no (ordinary) circumstances can you hand a child a forbidden food or an opportunity to violate a Torah prohibition.
Sources: OC 343:1; MB 343:4-6
L'ilui nishmat Zissel Devorah bas Avraham Abish on the occasion of her yahrzeit.
18 Iyar 5768 listen Chinuch: Giving a Child Forbidden Food (14:48)
In some situations, we need not prevent a child from eating something when he shouldn't.
Sources: OC 269:1; MB 269:1-3
1 Iyar 5768 listen Reciting Kiddush Lavana on Motzei Shabbos (15:02)
The ideal time for Kiddush Lavana is Motzei Shabbos -- within reason. Also: a brief summary of the works of Rav Yosef Caro, plus a bit of angeology.
Sources: OC 426:2-3; MB 426:4-6,18
L'ilui nishmat Moshe ben Hirsh on the occasion of his yahrzeit.
8 Iyar 5768 listen A Practical Guide to Shabbos (8): Shearing and Laundering (50:23)
This class covers the first two malachot involving dealing with cloth on shabbos.
Sources: Source Sheet
5 Nissan 5768 listen B'dieved, Havdala Can be Made on any of the Four Cups (14:04)
If you forget to make up for havdala in the second bracha, you have additional opportunities through the meal, the seder, and beyond. Also: washing hands for kiddush.
Sources: OC 473:1; MB 473:5-9
4 Nissan 5768 listen What if you forget Havdala in the Kiddush on Erev Pesach Motzei Shabbos? (15:43)
If you forget to make Havdala in Kiddush, how do you make up for your ommission?
Sources: OC 473:1; MB 473:4
3 Nissan 5768 listen Havdala and Shehechiyanu in Kiddush on Erev Pesach (15:16)
The Kiddush of Pesach on Motzei Shabbos is special in that it includes both Shehechiyanu and Havdala.
Sources: OC 473:1; MB 473:1,3
Dedicated as a zechut l'ilui nishmat Shaul ben Chana z"l for a refuah shleimah for Breina bas Frieda.
2 Nissan 5768 listen Hallel in the Seder; Kiddush and Hallel in Maariv on Pesach (11:58)
In the middle of the Pesach Seder, we recite Hallel; in the middle of Hallel, we interrupt to eat. How can we interrupt Hallel in the middle? Also: There are two special changes in Maariv for Pesach: many communities recite Hallel, and there is no Kiddush in shul.
Sources: OC 487:3-4; Pesachim 10:1; MB 487:10,16
Dedicated for a refuah shleimah for Breina bas Frieda and Tamar bat Sigalit.
24 Adar II 5768 listen A Practical Guide to Shabbos (6): Kneading (47:38)
Kneading is a relatively straightforward malacha with application in just a few circumstances.
Sources: Source Sheet
17 Adar II 5768 listen A Practical Guide to Shabbos (5): Grinding (Part 2) -- Medications (1:08:52)
Chazal made a general gezeira regarding medical treatment on shabbos based on the prohibition on grinding. This shiur discusses why and goes into the details of medications and medical treatment on shabbos.
Sources: Source Sheet
3 Adar II 5768 listen A Practical Guide to Shabbos (5): Grinding (Part 1) (53:49)
An introduction to the malacha of grinding, including its application to a variety of foods and circumstances.
Sources: Source Sheet
20 Adar I 5768 listen A Practical Guide to Shabbos (7): Cooking (Review) (1:02:01)
Using a series of questions and scenerios, this class reviews the various halachot of cooking as covered previously in the shabbos series.
Sources: Source Sheet
13 Adar I 5768 listen A Practical Guide to Shabbos (7): Cooking (Part 5) -- Cooking on Your Plate (1:09:09)
In certain circumstances, food can cook even in a kli sheini or kli shlishi.
Sources: Source Sheet
29 Shevat 5768 listen Borrer (12): Broken Matzos (4:45)
Choosing whole matzos from among broken matzos is a problem of borrer that presents itself every Pesach.
Sources: Ch"A Hil. Shabbos 16:14
29 Shevat 5768 listen A Practical Guide to Shabbos (7): Cooking (Part 4) -- Cooking in Pots off the Fire (1:02:55)
A review of many of the halachot of bishul, including chazara in detail; cooking in hot food off the fire.
Sources: Source Sheet
28 Shevat 5768 listen Borrer (11): Waiter, there's a fly in my soup! (16:49)
Dealing with common situations of borrer that occur during a meal: removing waste from food and peeling.
Sources: Ch"A Hil. Shabbos 16:12-13,15
24 Shevat 5768 listen Borrer (10): Curdling Milk (12:53)
According to the Chayei Adam, separating the parts of milk -- curds, whey, cream -- is all considered borrer.
Sources: Ch"A Hil. Shabbos 16:11
23 Shevat 5768 listen Borrer (9): Straining Eggs (16:50)
In yesterday's shiur (Borrer 8), we struggled to understand the confusing case of separating egg yolk and white by way of a mustard strainer. In today's shiur, Rav Dovid shares his chidushim that make sense of this difficult case.
Sources: Ch"A Hil. Shabbos 16:10; Shabbat 20:2; Rav Ovadia M'Bartenura, ad loc.; Shabbos 139b-140a; Rashi, ad loc.; OC 319:15; MB 319:58; Shaar HaTziun 319:47,49
22 Shevat 5768 listen Borrer (8): Strainers and Filters (15:31)
Strainers and filters can be used on shabbos in some circumstances but not others. This is an area where there is a very fine line between mutar l'chatchila and chayav chatas, and most of us often don't understand the differences.
Sources: Ch"A Hil. Shabbos 16:10
22 Shevat 5768 listen A Practical Guide to Shabbos (7): Cooking (Part 3) -- Insulating Hot Food (1:02:58)
Practical applications of the malacha of cooking continued, including hatmana (insulating) and the use of a "buffet cart" for warming food.
Sources: Source Sheet
21 Shevat 5768 listen Borrer (7): Separating a Liquid from Sediment (12:07)
Is there a permitted way to pour off a liquid from unwanted sediment or to remove fat from gravy on shabbos? How do you avoid borrer in such cases?
Sources: Ch"A Hil. Shabbos 16:9
11 Shevat 5768 listen Borrer (6): Filtering Liquids with a Strainer (14:37)
Even though it is a utensil made for separating, under some circumstances an actual strainer may be used on Shabbos.
Sources: Ch"A Hil. Shabbos 16:8
Dedicated l'ilui nishmat Aharon ben Meir on the occasion of his yahrzeit.
10 Shevat 5768 listen Borrer / Sorting (5): Filtering Drinkable Liquids (10:45)
Some liquids may be strained with a handkerchief without violating borrer, but straining others is an issur d'oraita.
Sources: Ch"A Hil. Shabbos 16:7
9 Shevat 5768 listen Borrer / Sorting (4): Separating Two Foods (15:30)
Borrer also applies when separating between two foods when one is desirable and one is not.
Sources: Ch"A Hil. Shabbos 16:5
8 Shevat 5768 listen Borrer / Selecting (3): Separating Bad Fruits (14:50)
Applying the rules of borrer to a common shabbos situation: separating good fruit from bad, or wilted lettuce from crispy.
Sources: Ch"A Hil. Shabbos 16:4,6
Given as a zechut for a refuah shleima for Tamar bat Sigalit.
8 Shevat 5768 listen A Practical Guide to Shabbos (7): Cooking (Part 2) -- Applying the Rules (1:11:42)
This class goes through many of the practical aspects involved in having hot food to eat on shabbos, including blechs, crockpots, hotplates, shehiya, chazara, and reheating.
Sources: Source Sheet
3 Shevat 5768 listen Borrer / Selecting (2): Conditions of Borrer (12:55)
For borrer to be permissible, three conditions must be met: the separation must be done by hand, by taking good from bad, and for immediate use. The Chayei Adam adds another condition: taking the lesser quantity from the greater.
Sources: Ch"A Hil. Shabbos 16:1
2 Shevat 5768 listen Zoreh / Winnowing; Borrer / Selecting: Introduction (15:39)
The malacha of zoreh (winnowing) has very few practical implications today. Borrer (selecting or sorting) is among the most difficult malachot to apply because it is so subtle.
Sources: Ch"A Hil. Shabbos 15; Shabb. 74a
29 Tevet 5768 listen Accidental Inclusion of Shabbos or Rosh Chodesh in a Weekday Amidah (14:57)
What if you accidentally include ya'aleh v'yavo in a weekday amidah?
Sources: OC 108:12; MB 108:37-38
25 Tevet 5768 listen Making Up for Mistakes in the Amidah (10:21)
We previously learned that you can make up for a missed shabbos amidah in the subsequent weekday amidah. But what if you mistakenly davened a weekday amidah on shabbos -- can you correct that error in a subsequent weekday amidah?
Sources: OC 108:11; MB 108:32-33
9 Tevet 5768 listen A Practical Guide to Shabbos (7): Cooking (Part 1) (1:02:26)
The malacha of cooking is very complex. While the rules are straightforward, there are many, many rules to remember and apply -- more than any other malacha.
Sources: Source Sheet
2 Tevet 5768 listen A Practical Guide to Shabbos (4): Winnowing, Selecting, and Sifting (Part 3) (1:01:04)
Common applications of borrer and how to handle them.
Sources: Source Sheet
18 Kislev 5768 listen Dosh / Threshing (Part 10): Sponges and Absorbed Liquids (15:49)
If squeezing liquid from a cloth is a form of dosh, sponges cannot be used on shabbos. How do we wash dishes? Clean a counter of table? Also: straining.
Sources: Ch"A Hil. Shabbos 14:13,15-16
17 Kislev 5768 listen Dosh / Threshing (Part 9): Melting Solids; Cleaning up Spills (15:53)
Applications of dosh related to melting include cracking ice, melting butter, and dissolving sugar. Also: cleaning up spills.
Sources: Ch"A Hil. Shabbos 14:11-12
16 Kislev 5768 listen Dosh / Threshing (Part 8): Squeezing Honey from Honeycomb (9:54)
Beehives are categorized as something that "grows from the ground," which makes honeycomb subject to dosh. This shiur details the halachot involved. As usual, we extract principles that are applicable elsewhere in dosh.
Sources: Ch"A Hil. Shabbos 14:10
11 Kislev 5768 listen Dosh / Threshing (Part 7): Juice that Seeps from Grapes on Shabbos (13:42)
The juice that seeps from grapes on shabbos is rabbinically prohibited. However, you can soak the grapes in existing wine and enjoy the new wine that comes out. NOTE: This lecture mentions a chasid who drank Southern Comfort. That story goes back to the 1980s; Southern Comfort is not considered kosher today due to wine-based additives.
Sources: Ch"A Hil. Shabbos 14:14
10 Kislev 5768 listen Dosh / Threshing (Part 6): Nursing (13:24)
Nursing is obviously permissible on Shabbos in spite of the dosh issues it presents. How are those issues handled when they come up? Also: the reason why cows are considered as growing from the ground; general parameters of pikuach nefesh as illustrated by several actual cases.
Sources: Ch"A Hil. Shabbos 14:9
Dedicated as a zechut for Tzipporah Feiga bas Chana Breina that she should have the privilege of raising children in a life of Torah.
10 Kislev 5768 listen A Practical Guide to Shabbos (4): Winnowing, Selecting, and Sifting (Part 2) (1:03:53)
Common applications of borrer and how to handle them.
Sources: Source Sheet
9 Kislev 5768 listen Dosh / Threshing (Part 5): Milking a Cow (13:50)
Cows and other animals are considered as growing from the ground, and this means that milking a cow is considered to be removing food (milk) from its natural container (cow). What are the parameters of dosh in this context?
Sources: Ch"A Hil. Shabbos 14:8
5 Kislev 5768 listen Dosh / Threshing (Part 4): Squeezing Out Liquids Absorbed in Foods (12:24)
Liquids absorbed in food, like oil in a fried food, have a different status from liquids naturally in food or even brine in pickles.
Sources: Ch"A Hil. Shabbos 14:6-7
Dedicated to Yechiel Isser ben Tuvia on the occasion of his yahrzeit.
4 Kislev 5768 listen Dosh / Threshing (Part 3): Squeezing Lemons and Pickles (15:40)
Is there a permitted way to squeeze lemon onto fish or into tea? To make lemonade? Can I squeeze the excess brine from my pickles?
Sources: Ch"A Hil. Shabbos 14:4-5
3 Kislev 5768 listen Dosh / Threshing (Part 2): Squeezing Fruits for Juice (13:13)
The first toldah of dosh is squeezing fruits for juice. How is this dosh? It is the process of removing the desired part (the juice) from its natural container (the fruit).
Sources: Ch"A Hil. Shabbos 14:2-3
3 Kislev 5768 listen A Practical Guide to Shabbos (4): Winnowing, Selecting, and Sifting (Part 1) (1:02:06)
Winnowing, selecting, and sifting together constitute "borrer", one of the most detailed and challenging malachot to understand and master. The distance between a permitted act and a Torah prohibition, says the Mishna Brura, is but a hair's breadth in width.
Sources: Source Sheet
2 Kislev 5768 listen Dosh / Threshing -- Introduction (10:57)
The av malacha, principles, and several examples of dosh (threshing).
Sources: Ch"A Hil. Shabbos 14:1
28 Cheshvan 5768 listen Birkat HaMazon on Motzei Shabbos / Erev Rosh Chodesh (15:10)
Birkat HaMazon on shabbos when Rosh Chodesh falls on Sunday (part 2). Do we include r'tzei for shabbos, Ya'aleh v'Yavo for Rosh Chodesh, or both?
Sources: OC 188:10; MB 188:33-34
27 Cheshvan 5768 listen Rosh Chodesh on Sunday (Part 1) (8:33)
When Rosh Chodesh falls on Sunday, there is a special haftara reading. Also: Birkat HaMazon on shabbos when Rosh Chodesh falls on Sunday (part 1).
Sources: OC 425:2; MB 425:9; OC 188:10; MB 188:32
24 Cheshvan 5768 listen A Practical Guide to Shabbos (3): Gathering and Threshing (1:30:39)
The conclusion of "Plowing, Planting, and Picking": Dealing with Houseplants; the next group of agricultural malachot: gathering and threshing.
Sources: Source Sheet
17 Cheshvan 5768 listen A Practical Guide to Shabbos (2): Plowing, Planting, and Picking (1:10:09)
This class covers the first three agricultural malachot: plowing, planting, and picking.
Sources: Source Sheet
30 Tishrei 5768 listen Rosh Chodesh on Shabbos (Part 2) (6:57)
Why was the Haftara for Rosh Chodesh on Shabbos chosen?
Sources: OC 625:1; MB 625:6-8; Isa. 66:23
1 Cheshvan 5768 listen A Practical Guide to Shabbos (1): Introduction (54:52)
An introductory level guide to Shabbos observance. This class covers a basic overview of the mitzvah of keeping Shabbos and the origins of the prohibited activities.
Sources: Source Sheet
29 Tishrei 5768 listen Rosh Chodesh on Shabbos (Part 1) (9:03)
When Rosh Chodesh falls on Shabbos we add Ya'aleh v'Yavo, read a special Rosh Chodesh Maftir, and recite a special haftara.
Sources: OC 625:1; MB 625:1-5
Dedicated in memory of Shnuer Zalman ben Shlomo on the occasion of his yahrzeit.
23 Av 5767 listen M'amer: Part 2 -- Other Forms of Gathering (12:42)
Salt, dirt, stones, pebbles, Cheerios necklaces, eggs, and seaweed.
Sources: Ch"A Hil. Shabbos 13:2-3
22 Av 5767 listen M'amer / Gathering: Part 1 (11:55)
The principle and Av Melacha of m'amer along with some basic examples.
Sources: Ch"A Hil. Shabbos 13:1
27 Tamuz 5767 listen Kotzer: Part 5 -- Gezeirot to Distance Us from Harvesting (13:56)
Chazal imposed a number of gezeirot to distance us from harvesting. Also: Understanding the reason(s) for gezeirot and more on Rav Dovid's favorite halacha.
Sources: Ch"A Hil. Shabbos 12:7-10
24 Tamuz 5767 listen Kotzer: Part 4 -- Trees, Stumps, and Grasses (13:31)
The details of the various gezeiros chazal made regarding trees, stumps, and grasses. Also: Rav Dovid's absolute favorite halacha!
Sources: Ch"A Hil. Shabbos 12:6
23 Tamuz 5767 listen Kotzer: Part 3 -- Vegetables and Spices Stored in Dirt; Introduction to Trees (14:20)
The halachos surrounding removing vegetables from dirt. Also: Using a tree; smelling fuits and flowers.
Sources: Ch"A Hil. Shabbos 12:3-5
Dedicated l'ilui nishmat Chaim ben Micha'el on the occasion of his yahrzeit.
20 Tamuz 5767 listen Kotzer / Harvesting: Part 2 -- Potted Plants and Flowers (16:23)
All potted plants are muktzeh, but cut flowers are not. Kotzer and zoreah are often the inverse of each other.
Sources: Ch"A Hil. Shabbos 12:2
19 Tamuz 5767 listen Zorea: Part 4 -- Potted Plants; Introduction to Kotzer / Harvesting (14:25)
Why are potted plants are muktzeh on shabbos? Also: Introduction to the malacha of kotzer and its relationship with zoreah.
Sources: Ch"A Hil. Shabbos 11:4; 12:1
16 Tamuz 5767 listen Zorea: Part 3 -- Pruning; Re-Planting a Potted Plant (12:02)
Third and fourth aspects of planting: pruning to promote new growth; re-planting an existing plant in the ground.
Sources: Ch"A Hil. Shabbos 11:4-5
13 Tamuz 5767 listen Zorea / Planting: Part 2 -- Seeding (14:50)
A second aspect of planting: placing seeds or stalks into water or on the ground. Also: dealing with cut flowers on shabbos; watermelon seeds; soaking grains and beans.
Sources: Ch"A Hil. Shabbos 11:2-3
12 Tamuz 5767 listen Zorea / Planting: Part 1 -- Watering (14:24)
The principle and av malacha of planting, including a discussion of psik reisha and its application.
Sources: Ch"A Hil. Shabbos 11:1
11 Tamuz 5767 listen Choresh / Plowing (17:29)
The malacha of plowing includes: plowing; digging; fertilizer; mulch; dragging a heavy bench or chair; sweeping; playing marbles or soccer; pushing a carriage; sprinkling sand or salt on ice.
Sources: Ch"A Hil. Shabbos 10:1-3
10 Tamuz 5767 listen The "Forty Minus One" Malachos and Tzitzit (13:42)
Why do chazal enumerate the malachos as "forty minus one" rather than thirty-nine? The full list of thirty-nine malachos and an illuminating explanation of their division into categories that indicates a relationship between the malachos and tzitzit.
Sources: Num. 15:32-41; Ch"A Hil. Shabbos 9:1
9 Tamuz 5767 listen Introduction to the 39 Malachos (15:47)
Where does the concept of the thirty-nine forbidden forms of work come from? How do we know there are thirty-nine, and how do we know what they are?
Sources: Ex. 20:7-10; Ex. 31:12-17; Rashi Ex. 31:13; Shabb. 49b; Ch"A Hil. Shabbos 9:1
3 Tamuz 5767 listen Two People Doing a Malacha Together (15:34)
When two people do a malacha together, the given act may be chayav, patur, or mutar -- it depends on the exact circumstances. The details of "shnayim she-asu".
2 Tamuz 5767 listen Intentionality (Part 3): Mitasek; Also: Shiurim for Malacha (13:21)
Complete lack of intentionality. Also: every malacha has a minimal shiur (measure) to be chayav.
28 Sivan 5767 listen Intentionality (Part 2): Lo Tzricha L'Gufa and Hitkaven L'Malacha Acheret (13:10)
Doing a malacha for a different purpose; intending to do one malacha but doing another instead.
27 Sivan 5767 listen Intentionality (Part 1): Lo Mitkaven and Psik Reisha (15:38)
Introduction to malechet machshevet and intentionality with regard to shabbos malacha.
26 Sivan 5767 listen Introduction to Shabbos Malachos: Chayav, Patur, and Mutar (13:57)
An introduction to the general principles of "work" on shabbos.
Dedicated by Ronald and Marion Stein l'ilui nishmat Menachem Mendel ben Yeshua Yaakov on the occasion of his yahrzeit.
29 Kislev 5767 listen Torah Readings on Chanukah, Shabbos Chanukah, and Rosh Chodesh Chanukah (11:09)
What is the Torah reading for Chanukah and why? What do we read on shabbos? Rosh Chodesh?
Sources: OC 684:1-2; MB 684:1-2,5,7
22 Kislev 5767 listen When the First Night of Chanukah Falls on Erev Shabbos (15:37)
When lighting Chanukah candles before Shabbos, it is best to daven Mincha first -- especially if it's the first night. Why? And what if you can't?
Sources: OC 672:1; OC 679:1; MB 679:1-2; Shaar HaTzium 679:7
Dedicated for chizuk for Oritte bat Aliza.
28 Tishrei 5767 listen Shabbos Mevarchim and Machar Chodesh (7:48)
On the shabbos before Rosh Chodesh, we announce the upcoming month. Also, if Rosh Chodesh falls on Sunday, we read a special haftarah on Shabbos.
Sources: OC 417; MB 417:1
2 Nisan 5766 listen Introduction to the Maggid (49:40)
From kiddush through the start of the maggid.
29 Kislev 5766 listen Lighting Chanukah Candles on Motzei Shabbos (7:23)
Which mitzvah comes first, Chanukah candles or Havdala?
Sources: OC 681:2; MB 681:2,3
19 Kislev 5766 listen The Importance of Chanukah Candles (10:15)
If you only have enough money for Chanukah candles or Shabbos candles, which takes precedence? What about candles vs. Kiddush wine?
Sources: OC 671:1; MB 671:1-3; Shabb. 23b; OC 678:1; MB 678:4

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Pesukei d'Zimra | Kriat Shema | Amidah | Geshem and Tal | Mincha
Kaddish | Amen! | Shabbos | Kiddush | Shofar | Teshuva
Rosh HaShana | Ten Days | Yom Kippur | Sukkos | Pesach | Sefirat HaOmer
Shavuot | Chanukah | Purim | Rosh Chodesh | Tu B'Shvat
Fast Days | The Three Weeks | Tisha B'Av | The Four Parshiyot | Parshat HaShavua
The Kosher Kitchen | Issur v'Heter | Speaking to G-d | Spiritual Reality, Spiritual Freedom
The Jewish Calendar | Chinuch: Education | A Practical Guide to Shabbos | Rav Dovid's Shiurim
True or False? | Respect for Parents, Elders, and Torah Scholars | Ben Adam l'Chaveiro
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