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Why does rov work for pirish (something found) but not kavuah (fixed location)? The shiur develops the Tosafot HaRosh's insight that rov addresses halachic reality, not factual reality. When you find meat, the question is whether you may eat it (halachic) — but when entering a store, the question is which store you entered (factual).
This shiur analyzes a fundamental principle in the laws of doubt and majority rulings (rov), focusing on Kesubos 14b and the distinction between kavuah (fixed location) and pirish (something that separated from a group). The Gemara (גמרא) establishes that kol kavuah k'machtzah al machtzah tadami - anything fixed is treated as if it's half and half, even if there's a clear majority, while with pirish we follow the majority. Rav Kiveigis raises several challenging questions on this principle. From Bava Metzia 6a regarding ma'aser behemah, he asks why we can't rely on rov when one already-counted animal jumps back into the herd. The Shitah Mekubetzet explains that rov has a din of safek (doubt), not certainty, yet our Gemara seems to use rov for leniency. Kiveigis also challenges this from a Tosefta where rov works even in reshus hayachid for tumah questions.
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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 14b
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