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Why would the Gemara (גמרא) challenge Rav Elazar from safek sfeika? The shiur develops that problems requiring clarification cannot be resolved through statistical possibilities alone. A woman known to be a beulah requires actual birur, while a woman maintaining her bethulah status needs only absence of definitive contradiction.
The shiur analyzes a fundamental question in Kesubos 9a regarding the nature of safek sfeika and when it provides a heter. The Gemara (גמרא) challenges Rav Elazar who holds that a woman found to be a beulah is forbidden to her kohen husband even in a case of safek sfeika. Rabbi Zweig questions why the Gemara assumes this should be permitted as a safek sfeika when normally we follow the principle of efshar levarer - until you clarify, it remains forbidden. The analysis begins with examining Rashi (רש"י)'s approach that the woman must currently be a gedolah, as a ketanah would be permitted since anus to a ketanah is considered halachically inconsequential. This leads to a discussion of when safek sfeika applies and whether the timeframes involved create true fifty-fifty doubts or merely statistical possibilities.
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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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