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What are the competing approaches of the Rambam (רמב"ם) versus Tosafot regarding whether a wife who was mezana requires witnesses (eidim) to be forbidden to her husband? The shiur develops the fundamental machloket between viewing this as a monetary-like din (requiring higher standards of proof) versus an isur-focused din, with practical ramifications for safek cases.
This advanced Gemara (גמרא) shiur analyzes a complex sugya in Kesubos 9a dealing with the halachic status of a wife who was mezana (committed adultery) and the evidentiary standards required to prohibit her to her husband. Rabbi Zweig examines multiple approaches from Rishonim regarding the fundamental nature of this prohibition. The shiur begins with the core machloket between the Rambam (רמב"ם) and other Rishonim (particularly the Rosh and Rabbeinu Yonah) regarding whether such a woman is believed when she claims "mi she'asani nenasti" (I was forced) or "lav tachas" (it wasn't consensual). The Rambam holds she is not believed, while the Rosh disagrees, leading to fundamental questions about the underlying halachic framework.
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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 9a
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