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Why does a miggo work for one case but not another when witnesses saw different levels of impropriety? The shiur develops Tosfos's position that ma'alos habiyuchsin requires eidim only when there's a genuine safek, but when testimony creates certainty (like sfeik sfeika or valid miggo), the requirement is bypassed.
This shiur provides an intricate analysis of Gemara (גמרא) Kesubos 13a, focusing on the dispute between Rav Gamaliel and Rabbi Yehoshua regarding when a woman is believed about her status after witnesses observe suspicious behavior. The central tension explored is why a miggo (logical argument of 'she could have said something better') works in some cases but not others when ma'alos habiyuchsin (strictness regarding lineage) applies. Rabbi Zweig carefully examines Tosfos's approach versus Rashi (רש"י)'s interpretation. According to Tosfos, if the Mishna mentioned only one case, we would understand everything from Rav Gamaliel's perspective, with the second case teaching us Rabbi Yehoshua's position. However, a fundamental question emerges: how do we know that 'meuberes' (pregnant) refers to having a child rather than just being a euphemism for relations?
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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 13a
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