יומא
37 shiurim · 7 dafim covered
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11 shiurim
Why does the Rambam write both "issur" and "mitzvah" when describing Yom Kippur's prohibition on washing? The shiur builds a yesod that the inuyim contain two separate dinim de'oraisa: an issur asei forbidding rechitzas kol haguf, and a mitzvas asei requiring total abstention from water contact. This chakira resolves multiple contradictions in the Rambam and explains why chachamim can permit washing in limited cases.
How can a shevuah prohibiting eating create an issur on less than a kezayis when yesterday that amount was permitted? The shiur distinguishes between chatzi shiur as an issur ta'am (taste) versus an issur achilah (eating), arguing that a shevuah transforms a half-measure into a complete act of eating — like a beriah — thereby creating a new prohibition category entirely distinct from the Torah's underlying chatzi shiur issur.
How can chatzi shiur be prohibited on Yom Kippur when Yom Kippur's prohibition is lo se'uneh (affliction), not achilah (eating)? The shiur resolves this through a fundamental distinction: chatzi shiur on Yom Kippur is not about violating lo se'uneh, but about nullifying the mitzvat aseh of shevisa (cessation) from eating and drinking—a completely different framework that transforms our understanding of inui on Yom Kippur.
When does a false oath by a witness trigger a korban obligation? The shiur analyzes the fundamental dispute between Rav Acha bar Yaakov and Rav Pappa: is the korban due to causing monetary loss, or due to the insult of denying testimony when obligated to help? This chakira resolves major difficulties in the Gemara and Rambam regarding psul eidus d'rabanan and the king's exemption.
Can a shevuah take effect on something already forbidden by rabbinic decree? The Gemara's treatment of Reish Lakish's view—that a shevuah is chal on a chatzi shiur of neveilah because midoraisa it is mutar—presents serious textual difficulties: the Gemara appears to answer with "v'chiteima" (usually a rejected premise), and the apparent contradiction with later Amoraim Rav Papa and Rav Acha bar Yaakov requires resolution.
What is the measure of chatzi shiur (half-measure) that's forbidden on Yom Kippur? The shiur analyzes whether the Gemara's din of chatzi shiur min haTorah applies the same way to Yom Kippur as it does to forbidden foods. A fundamental distinction emerges: in prohibited foods chatzi shiur means kol shehu, but on Yom Kippur—where the issur is inui, not mechales asuros—the Rambam requires hanachas grono, something close to a kezayis.
Why is chatzi shiur (less than the required measure) forbidden on Yom Kippur when it's not a chefetz ha'issur (inherently forbidden object)? The shiur explores the machloket between Rabbi Yochanan and Reish Lakish: Rabbi Yochanan holds chatzi shiur constitutes a ma'aseh achilah (act of eating), thereby negating the mitzvah of fasting, while Reish Lakish holds it's not considered eating at all.
Are the five inuyim (afflictions) on Yom Kippur intrinsic prohibitions or failures to fulfill a positive mitzvah? The shiur develops a fundamental dispute between Rashi, Ran, and Rambam on whether washing, anointing, etc. are forbidden as issur aseh (prohibition) or missed opportunities to fulfill shevisa (rest). This chakira reshapes the heter for kala, melech, and chayah, explains why a gadol may wash a child, and reveals why women are obligated despite shezman grama.
How can a shevuah be chal on eating chatzi shiur if it's already forbidden? The Gemara distinguishes between derabanan and de'orayta prohibitions. The Rambam and Meiri offer fundamental approaches to understanding shevuot: the Meiri distinguishes between intrinsic issurim and harchakah, while the Rambam treats shevuot as declaratory statements rather than commitments.
Is eating chatzi shiur (less than the minimum measure) a quantitative lack in the act of eating, or a qualitative one? The shiur develops the Rambam's shittah that chatzi shiur represents not merely "half the amount" but a distinct issur—a ta'am rather than achilah—derived from the ribui of "kol." This yesod has major nafka minas for shevu'os, bal ya'ir u'bal yeira'eh on Pesach, and ta'anis.
Why does eating less than a kezayis on Yom Kippur violate a Torah prohibition? The Minchas Chinuch argues it cannot stem from lo se'aneh (which has no chatzi shiur as an issur gavra), but rather from the obligation to be shoves—resting from eating. The machlokes Rabbi Yochanan and Reish Lakish thus hinges on whether any amount constitutes ma'aseh achilah, thereby negating shevitah.
2 shiurim
Why can a shevuah take effect on chatzi shiur when the measure itself is only rabbinically prohibited? The shiur develops a fundamental yesod through Yoma 74a: a shevuah "shelo yochal kol shehu" creates a new beriah — a complete ma'aseh issur — transforming a partial measure into a distinct prohibition independent of the underlying chatzi shiur issur derabbanan.
1 shiur
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6 shiurim
Why is eating dry pepper exempt on Yom Kippur while eating fresh ginger is obligatory, even though neither is eaten normally? The shiur analyzes the Gemara's two separate halachos and argues the Rambam distinguishes: eating requires normal derech achilah (the pepper case), but Yom Kippur's "yeshuv hadaas" can be violated even by non-standard eating that reduces hunger (the ginger case). This resolves both the Maggid Mishna's textual difficulty and the Tosfos Yom HaKipurim's question about chatzi shiur.
7 shiurim
What is the nature of educating children to fast on Yom Kippur—are we training them in the mitzvah of inui (affliction) or keeping them from the issur of eating? The shiur analyzes the machlokes between Rashi and the Rambam on ein ma'anin, explores whether chinuch applies to lo sa'asehs or only to asehs, and resolves how the Rambam calibrates partial fasting as a legitimate kiyum of inui for children.
1 shiur
8 shiurim — daf not yet assigned
Why does Torah become "zar" (foreign) when one doesn't merit it, rather than simply absent? The shiur develops a fundamental principle: Torah isn't external to who we are—it's integrated into our essence. When merited (zachor), it becomes a crown (zer); when not (lo zachor), it becomes antagonistic like a rejected transplant, a sama d'musa rather than sama d'chayei.
Why can't a king testify in Jewish law? The Rambam distinguishes two separate halachos: mideoraisa, a king is not *obligated* to testify (eino chayav lehoi'ot)—but he may if he wishes. Chazal added a rabbinic disqualification for a Melech Yisrael alone: he is *pasul* from testifying due to intimidation. This framework resolves major contradictions in the Rambam and explains the Gemara's kal vachomer.
Why does the Torah say "tisha b'erev" (ninth in the evening)—is that the ninth or the tenth? The Rambam's chiddush: Yom Kippur's night is actually a continuation of the ninth day regarding inui (affliction), which is why tosefes (adding from chol to kodesh) applies. This creates a unique split: inui begins on the ninth and extends through the night, while issur melacha only begins on the tenth.
Why is a father obligated to educate his child in lo sa'aseh (negative commandments) when there's no benefit to the child—ein bezdin metzuvah lafrisha? The shiur develops a fundamental chakira: chinuch on asehs (positive commandments) benefits the child directly, while chinuch on lo sa'aseh flows from the father's obligation of Talmud Torah—to teach his son Torah liman amanat la'asos (with intent to practice). This explains why mothers are exempt from chinuch on lo sa'aseh.
Why does the Rambam rule that for pikuach nefesh one must cut from a single branch with three figs rather than from two separate branches with one fig each? The shiur reveals two distinct principles: taking extra fruit to avoid additional melachah may be hutrah (fully permitted) while the cutting itself remains dechuyah (merely pushed aside). When both options exist, one is obligated to choose hutrah over dechuyah.
