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Why does the Tosafos (תוספות) Rishonim reject sfeik sfeika here, claiming it's ein misapach? The shiur develops two approaches: either we have only a halachic safek (not a metzius safek) since rov says he's a baki, or smoch miyut l'chazakah creates a din safek but not true fifty-fifty odds that would allow another miyut to tip the scales.
This shiur addresses multiple complex questions on Tosafos (תוספות) in Kesubos 9b regarding sfeik sfeika (double doubt) in cases of eishes ish. The Gemara (גמרא) discusses a woman whose husband claims she committed adultery based on finding a pesach (פסח) pasuach (evidence of relations). The basic question is whether she loses her kesuvah and becomes forbidden. Rabbi Zweig begins by outlining several fundamental questions: Why does Tosafos require a chazakah here when it's already a sfeik sfeika? What's the mechanism by which sfeik sfeika can override the principle of ein ochin mamon acharov (we don't remove money based on doubt)? Why does the Tosafos Rishonim claim this sfeik sfeika is ein misapach (not applicable)?
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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 9b
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