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When does the principle of shavi nafsh'cha tachticha l'issur (one makes oneself liable through his own statement) apply? The shiur analyzes competing interpretations of whether this din requires expertise, intelligent opinion, or functions even without knowledge. Three approaches emerge regarding the relationship between credibility and self-imposed prohibitions.
This shiur provides an in-depth analysis of a complex sugya in Kesubos 9a dealing with the principle of shavi nafsh'cha tachticha l'issur - when a person's own statement creates a prohibition for himself. The primary case involves a man who claims to have found pesach (פסח) pasuach (evidence of his wife not being a virgin), which would normally prohibit her to him. The Gemara (גמרא) initially suggests that this principle doesn't apply when the person lacks expertise (eino baki), leading to three possible interpretations. Rabbi Zweig examines whether the conclusion (maskana) means: (1) the person must be a genuine expert (baki), (2) an intelligent opinion suffices even without expertise, or (3) the principle applies even when we know the person lacks knowledge.
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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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