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How can bori v'shem work in our sugya when Rav Yehuda holds it doesn't work in Bava Kamma? The key distinction: when there's a shtar, the husband becomes only a tofes (holder) rather than an owner. A migo can extract money from a tofes, unlike from a true owner.
The shiur addresses a fundamental question raised by the Tosafos (תוספות): how can our Gemara (גמרא) apply the principle of bori v'shem (one who is certain vs. one who is uncertain) when Rav Yehuda explicitly holds in Bava Kamma that bori v'shem lo bori yadaf (the certain one does not prevail)? The apparent contradiction seems insurmountable since both cases involve a shem tov (reasonable uncertainty). Rabbi Zweig develops a comprehensive framework distinguishing between different types of monetary possession. In Bava Kamma, the defendant is considered a true owner (mochzik) of his money. The principle 'chazakas kol mah shetoach yado shel adam shelo hu' - we assume whatever is in a person's possession belongs to him - creates a strong presumption of ownership. Against such ownership, one cannot extract money with mere bori v'shem; formal proof (rayah) is required through the principle 'hamotzi m'chavero alav harayah.'
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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 12b
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