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Why does the Gemara (גמרא) say this case is only chad safeik when seemingly there's a sfeik sfeika d'asur (safek tachas, and even if lav tachas, safek goy)? The shiur analyzes the fundamental machloket between Rashi (רש"י) and Tosafot about whether chazaka can be mevarer (decisively resolve) a safek versus merely preserving status quo when facing conflicting chazakot.
This advanced shiur analyzes a complex sugya in Kesubos 9a dealing with the halachic status of a woman whose virginity is in question for kehuna purposes. The Gemara (גמרא)'s kasha is that it should be a sfeik sfeika (double doubt) permitting her, while the teretz is that it's only chad safeik (single doubt), making her forbidden. Rashi (רש"י) explains the Gemara straightforwardly: the kasha assumed sfeik sfeika would permit her, but the answer reveals it's actually chad safeik, which creates an issur mi-safeik. According to Rashi, she's asur because of the safeik itself - a safek deraisa lechumra.
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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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