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When is someone liable for fire damage: as koach (one's force) or as mamon (one's property)? The shiur traces the fundamental machloket between Rav Yochanan and Reish Lakish, analyzing Rashi (רש"י)'s revolutionary reading that fire spreading naturally is already not koach (versus Rabbeinu Chananel, who says only koach achar meurav bo—wind-driven movement—creates that distinction). The implications reach far beyond fire, touching acid damage, gravitational force, and defining what counts as "your" destructive act.
This shiur analyzes the fundamental machlokes between Rav Yochanan and Reish Lakish on Bava Kamma 22a regarding the liability for fire damage. The opening question is straightforward: when a person starts a fire that spreads and damages someone else's property, is the person liable because fire is classified as "chitza" (an arrow, representing one's force/koach) or "mamona" (one's property)? Rav Yochanan holds esseh b'shem chitza, while Reish Lakish holds esseh b'shem mamona. Rabbi Zweig begins by explaining the basic reading of the Gemara (גמרא) before examining the Rishonim: a person makes a fire in his field, doesn't contain it, and it burns someone else's field. Reish Lakish challenges Rav Yochanan's position by arguing that fire cannot be called chitza because chitza is koach (direct force), whereas fire involves koach achar meurav bo (force mixed with something else—here, the wind). Rav Yochanan counters that fire cannot be classified as mamon because "leis bei mamasha"—it lacks tangible substance that can be owned.
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Bava Kamma 22a
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