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Why does the Rambam (רמב"ם) require a shiur (minimum amount) for mefareik on animals but not for human chaburah on Shabbos (שבת)? The shiur develops two distinct categories of mefareik: for animals/growing things, one must need and use the liquid extracted; for humans, the melacha is accomplished through separation itself.
The shiur addresses fundamental questions about the Rambam (רמב"ם)'s understanding of mefareik (separating liquids from solids) as a toldah of dosh (threshing). The Rambam's position conflicts with Rashi (רש"י), who views chaburah as a coloring issue rather than separation. Several difficulties emerge with the Rambam's approach: First, the Gemara (גמרא) states that if blood is mufkad pakid (pooled like in a reservoir), there's no issur chaburah, yet the Rambam considers milking a cow as mefareik despite Rashi saying the milk is mufkad pakid. Second, pressing olives or grapes involves mefareik, yet the Gemara in Pesachim 33 describes their liquids as mufkad pakid. Third, the Rambam requires a shiur k'grogeres for mefareik, but dam besulim requires no shiur. Fourth, the Gemara's principle of "mitoch she-huchtar l'tzorech ochel nefesh" shouldn't apply to chaburah if it's mefareik, since dosh isn't permitted for food preparation on Yom Tov.
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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 6a
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