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How does the Rambam (רמב"ם) understand the melacha of mefarek when extracting blood or other liquids? The shiur develops a novel reading that mefarek requires both taking out the liquid AND needing it as ochel (food). This resolves major contradictions between the Rambam and Gemara (גמרא) regarding whether mifkad pokad (naturally stored liquid) constitutes mefarek.
This shiur presents a comprehensive analysis of the melacha of mefarek (extracting liquids) on Shabbos (שבת), focusing on a fundamental machlokes Rishonim regarding what constitutes this prohibition. The Gemara (גמרא) in Kesubos 5b discusses whether blood-letting on Shabbos is permitted, with the key distinction being dam mifkad pokad (blood that is naturally stored) versus chbur mechber (blood that is attached/connected). The Rambam (רמב"ם)'s position creates significant difficulties for the Acharonim. In Hilchos Shabbos, the Rambam states that mefarek is a toldah of dosh (threshing), and one is only liable when there is tzorech ledam - a need for the blood. The Chasam Sofer raises a fundamental contradiction: if mifkad pokad exempts from mefarek, how can we explain that squeezing grapes and olives (where the wine and oil are mifkad pokad) constitutes a biblical violation of schita?
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Why does halacha forbid entering dangerous places if everything happens by Divine decree? The shiur examines the debate between Rashi and Tosfos on traveling at night, developing a fundamental distinction: Rashi holds one must avoid even deserved punishments that Hashem delays through mercy, while Tosfos holds the prohibition addresses self-inflicted harm through free will. This framework reveals how people rationalize self-destructive behavior as "hashgacha."
Why does the Gemara praise hospitality to scholars as a unique mitzvah rather than ordinary hachnasas orchim? The shiur distinguishes two mitzvahs: hachnasas orchim (providing for those in need) and connecting to talmidei chachamim (cleaving to God through scholars). Yisro's meal for the Jewish leaders wasn't charity—it was his way of bonding with those transformed by Torah, teaching that learning must fundamentally change who we are.
Kesubos 5b
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