Hilchos Shabbos | Rabbi Meir Finkelstein (Yeshivat Kerem B'Yavneh)

Yeshivat Kerem B'Yavneh
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Shiurim by Rabbi Meir Finkelstein in KBY. Enjoyed? Your feedback means a lot to us. Click here to email us: https://tinyurl.com/thanksEN Donations: https://www.kby.org/english/support-us/?id=46

  1. 2D AGO

    Ramifications of Insulation (pt.2 of 2)

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. Top exposure dispute — The Rama and many Rishonim (including Rabbeinu Tam and Or Zarua) rule that if a pot is exposed at the top, it is not considered hatmana, while the Mechaber disagrees. 2. Partial insulation limits — There is significant ambiguity in the Poskim regarding how much of a pot must be uncovered to avoid the prohibition of hatmana, with some sources suggesting rubo (the majority) and others saying even a small opening suffices. 3. Heat source foundation — According to the Shulchan Aruch, performing hatmana (even with a non-heat-adding material) on top of a heat source like a stove is forbidden because the stove turns the insulation into davar hamosif hevel. 4. Airspace exception — A critical practical rule is that hatmana only applies when the insulating material is touching the vessel; if there is a gap of avir (airspace), it is permitted. 5. Modern applications — These complex definitions of hatmana directly impact the use of modern appliances like crockpots and hot plate covers (blechs) on Shabbos. 6. Customs of Israel — Tosafot highlights the importance of justifying minhag ha-olam (videspread custom), seeking halachic bases for common practices even when they seem to contradict strict interpretations of the Gemara. 7. Cooking vs. Insulation — Some cases appearing to be hatmana issues (like placing one pitcher on another) are actually interpreted by Tosafot as part of the laws of bishul (cooking) and the rabbinic decree against placing items near heat.

    29 min

  2. 2D AGO

    Ramifications of Insulation (pt.1 of 2)

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. Hatmana definition dispute — There is a fundamental disagreement regarding whether partial insulation, known as hatmana bi-miktzas, is legally considered insulation. 2. Mechaber's strict view — The Shulchan Aruch (Siman 253) rules that if a pot even touches the coals at the bottom, it is considered hatmana and is forbidden. 3. Rama's lenient view — The Rama rules that as long as the pot is exposed on top, it is not considered hatmana, even if it sits directly on the coals. 4. Prerequisite for Shehiya — According to the Mechaber, all the leniencies of shehiya (leaving food on the fire) only apply if the pot is elevated on a tripod and not touching coals. 5. Support for strictness — Major Rishonim such as Rabbeinu Chananel, the Rosh, the Ran, and the Tur are cited as supporting the stricter definition of hatmana. 6. Ashkenazic practice — The Rama concludes that the common custom followed by Ashkenazim is to be lenient, allowing pots to sit directly on the heat source. 7. The Or Zarua's phrasing — While the Or Zarua (quoted by the Mordechai) allows sitting a pot on coals, the Beit Yosef analyzes whether this actually disputes his own definition. 8. Halachic implications — This machloket changes the entire landscape of how one prepares a blech or heat source for Shabbat, depending on whether one follows Sephardic or Ashkenazic rulings.

    5 min

  3. APR 28

    Insulating Your Food

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. Dual Halakhic Categories — The laws of hatmana (insulation) distinguish between mosif hevel (adding heat) and eino mosif hevel (merely preserving existing heat). 2. Temporal Restrictions — Insulation that adds heat is forbidden starting from Friday (erev Shabbos), whereas insulation that only preserves heat is forbidden only once Shabbos begins. 3. Reason for Prohibition — The primary concern for eino mosif hevel on Shabbos is shema yartiach (lest the food cool and one re-boils it), while for mosif hevel it is shema yechateh (lest one stoke coals). 4. Rambam's Unique Girsah — The Rambam (Hilchos Shabbos) reverses the traditional reasons found in our texts, explaining erev Shabbos prohibitions as a safeguard against accidentally insulating on Shabbos itself. 5. Hatmana vs. Shehiyah — While shehiyah (leaving food on a fire) has many leniencies like ma'achal ben drosai, Rabbeinu Tam rules that these do not apply to hatmana because trapped heat makes stoking more tempting. 6. Consequence of Violation — Food insulated in violation of mosif hevel laws is forbidden even be'dieved (after the fact), though the Rema cites lenient views for unintentional acts (beshogeg). 7. The Plaster Leniency — Using toach betit (plastering a lid shut) is a valid way to permit certain insulation because it prevents any physical access to the coals. 8. Purpose of Covering — Covering a pot is only considered hatmana when done to keep it warm; covering it to protect from mice or dirt is permitted according to the Rashba. 9. Dedicated Pot Covers — Rav Moshe Feinstein rules that using a dedicated lid (kisui hameyuchad) is always permitted, as it serves multiple protective functions beyond just insulation. 10. Modern Foil Usage — Wrapping food in aluminum foil on Shabbos to heat it may constitute hatmana, as foil is not a "dedicated" pot lid and its primary purpose is heat retention. 11. Hot Tray Dilemma — Rav Shlomo Zalman Auerbach raises a concern that covering food on a hot tray might be hatmana b'davar hamosif hevel, a stringency that challenges common home practices. 12. The Crockpot Question — The central modern hatmana debate focuses on whether a crockpot—which insulates the sides but leaves the top exposed—falls under the prohibition.

    42 min

  4. MAR 18

    Bishul B'Davar Sheino Ochel

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. *Ma’aseh Shabbat rulings* — There is a three-way dispute among the *Tannaim* regarding benefit from a *melacha* performed on *Shabbat*: *Rabbi Meir* permits it on *Shabbat* if done *beshogeg* (unintentionally); *Rabbi Yehuda* permits it only after *Shabbat* if done *beshogeg*; and *Rabbi Yochanan HaSandlar* prohibits it forever for the transgressor even if done *beshogeg*. 2. *Psak and necessity* — The *Shulchan Aruch* (318:1) follows *Rabbi Yehuda*, but the *Vilna Gaon* rules like *Rabbi Meir*; in cases of great need (*makom tzorech*), one may rely on the *Gra*. 3. *B'kdei sheyeasu requirement* — *Rashi* holds that when food becomes permitted on *Motzaei Shabbat*, one must wait the amount of time it takes to perform that action (*b’kdei sheyeasu*), whereas the *Rambam* (Hilchot Shabbat) generally does not require this for *bishul*. 4. *D'rabbanan leniency* — The *Vilna Gaon* and *Biur Halacha* clarify that for a *shogeg* violation of a rabbinic prohibition (*issur d’rabbanan*), such as turning on most modern lights, one may follow the lenient view of *Rabbi Meir*. 5. *Non-food cooking* — Performing *bishul* on non-food items, such as hardening a wooden peg or heating tar, constitutes a Torah prohibition of *mevashel* according to the *Gemara* (Shabbat 74b). 6. *Defining bishul* — *Rashi* defines *bishul* as softening a hard substance, while the *Rambam* (Perek Tet) rules that both softening a hard object and hardening a soft object (such as metal or clay) are included in the *melacha*. 7. *Residual moisture* — The *Mordechai* suggests that cooking a wooden peg is prohibited because it boils the absorbed water within; this is the basis for the *halacha* that one cannot place a frozen *challah* with visible frost on a hot plate. 8. *Intention in bishul* — There is a seemingly contradictory *Gemara* regarding *bishul akum*; however, the *Ramban* and *Ritva* explain that on *Shabbat*, even an unintended but inevitable result (*psik reisha*) is prohibited, whereas the rabbis were less stringent regarding *bishul akum* when the intent was merely to harden a vessel.

    30 min

  5. MAR 13

    Hagasa(Stirring a Pot) and Scooping from a Pot

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. *Defining Hagasa* — The act of *hagasa* (stirring) is a forbidden step in the *bishul* process on *Shabbat*, as established in the *Gemara* (*Beitzah 34a* and *Shabbat 18b*). 2. *Conceptualizing the Isur* — While *Rashi* views stirring as a direct act of cooking, the *Rambam* classifies it as *mitzorechei habishul* (needs of the cooking process), comparing it to *schita* (squeezing) in the laundering process. 3. *Ladling as Hagasa* — Most *Rishonim*, including the *Rashba*, *Ran*, and *Rosh*, assume that *hotza’ah b’kaf* (ladling food out of a pot) is halachically equivalent to stirring and is generally restricted. 4. *Cooking Status Matters* — According to the *Rashba*, there is no *isur* of *hagasa* once food reaches the state of *ma’achal ben drusai*; however, we follow the *Rambam* and *Tosafot* who hold that the restriction remains until the food is *mevushal kol tzorcho* (fully cooked). 5. *On vs. Off the Fire* — The *Rambam* only prohibits ladling when the pot is still on the fire; the *Shulchan Aruch* and *Mishnah Berurah* clarify that even a *kli rishon* removed from the heat is subject to certain restrictions against stirring. 6. *The Kolbo’s Chumra* — The *Kolbo* presents a stringent view that stirring is prohibited even for fully cooked food as long as it remains on the fire, a position the *Sha’ar Hatziyun* finds difficult to reconcile with the principle of *ein bishul achar bishul*. 7. *Practical Ladling Rules* — Per the *Mishnah Berurah*, the *ikar hadin* (core law) allows stirring fully cooked food, but we adopt a *chumra* for stirring on the fire; however, one may certainly ladle from a fully cooked pot that has been removed from the fire. 8. *Crockpot Solutions* — For a Friday night *cholent* where the pot cannot be removed due to *hachzara* concerns, the *Chazon Ish* permits ladling directly from the heat if the food is *mevushal kol tzorcho* and no other option exists.

    40 min

  6. MAR 10

    Tea and Coffee

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. *Tea in a *Kli Sheni** — *Rav Chaim Kanievsky** permits making tea in a *kli sheni*, arguing that tea leaves are categorized as *tavlin* (spices), which the *Mishna* (*Shabbos* 42b) teaches do not cook in a *kli sheni*. 2. *The Essence Solution* — The *Mishnah Berurah* (*Siman* 318:39) suggests preparing "tea essence" before *Shabbos* to avoid *bishul*. On *Shabbos*, one may add this liquid essence to a *kli sheni* of hot water, relying on the view that *bishul achar bishul* (cooking after cooking) for liquids is not a concern in a *kli sheni*. 3. *Instant Coffee Status* — Since instant coffee is pre-cooked during manufacturing, *Rav Moshe Feinstein* permits making it even in a *kli rishon* (*Iggros Moshe* O.C. 4:74); however, due to concerns that it completely liquefies, many follow the *Mishnah Berurah’s* stringency regarding salt and use a *kli sheni*. 4. *Residue and Droplets* — When refilling a cup, *Rav Moshe Feinstein* is lenient regarding the residual cold droplets from the first cup, while others suggest the droplets are *batul* (nullified) to the new hot water or that the act is a *psik reisha d'lo nicha lei* (an unintended, non-beneficial result). 5. *Solids that Liquefy* — A central principle in *Hilchos Bishul* is that a solid which melts (like fat in an *Inpanada*) is judged by its initial state as a solid; thus, *ein bishul achar bishul* applies despite the change in form (*Shulchan Aruch* 318:16). 6. *"Via" and Micro-grounds* — For specialty coffees containing raw micro-ground beans, using a *kli shlishi* is recommended to avoid *bishul mamash*, as the ground beans have never been cooked. 7. ***Borer* in Brewing** — Pouring hot water over coffee grounds in a filter does not violate *borer* (sorting), because the process starts and ends without a *ta'aroves* (mixture) of solids and liquids, following the *Mishnah Berurah's* ruling on straining wine (*Siman* 319:33).

    49 min

  7. MAR 4

    Bishul After Afeia/Tzleia and Vise Versa

    AI-Generated Summary (AI can be inaccurate. Check important information): 1. *Cooking doesn't undo identity* — While *halacha* normally maintains that cooking a vegetable does not change its essential status (remaining *Borei Peri Ha’adama*), a special dispute exists regarding whether cooking can undo a previous state of roasting or baking. 2. *Matzah and Korban Pesach distinction* — The *Gemara* in *Berachos* suggests that cooked *matzah* is invalid only because of a specific requirement for *ta'am matzah* (the taste of *matzah*), whereas the *Gemara* in *Pesachim* uses the same case to suggest a general principle that cooking (*bishul*) overrides roasting (*tzli*). 3. *General status vs. process* — The *Eglei Tal* resolves contradictions between the *sugyos* by distinguishing between a food's essential identity (a vegetable remains a vegetable) and the physical process it underwent (cooking can replace baking or roasting). 4. *Shabbos as an exception* — The *Taz* suggests that *Hilchos Shabbos* may be stricter than other areas of *halacha*; even if cooking doesn't legally "undo" baking elsewhere, on *Shabbos*, adding or changing flavor through heat constitutes an act of *bishul*. 5. *Practical application for reheating* — There is a significant *machlokes* regarding whether one may place baked *challah* on a *platta* (roasting after baking) or put cooked chicken on a *platta* (roasting after cooking), with many being *meikel* (lenient) based on the *Magen Avraham* and *Shiltei Gibborim*. 6. *Bread in soup bowls* — Although we are generally *machmir* (stringent) not to put baked bread even into a *kli sheni* (secondary vessel), the *Mishna Berurah* permits putting bread into a soup bowl if the soup was moved via a ladle, effectively treating the bowl as a *kli shlishi* (tertiary vessel) in the context of this specific stringency.

    43 min

  8. FEB 11

    Kli Sheini and Kli Shleshe

    Hilchos Shabbos | Rabbi Meir Finkelstein (Yeshivat Kerem B'Yavneh)

    45 min
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Shiurim by Rabbi Meir Finkelstein in KBY. Enjoyed? Your feedback means a lot to us. Click here to email us: https://tinyurl.com/thanksEN Donations: https://www.kby.org/english/support-us/?id=46

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