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What's the nature of liability for fire damage—is it liability for your action (ketzio) or for your property (mamono)? The Gemara (גמרא) presents a fundamental dispute between Rabbi Yochanan and Reish Lakish. Rashi (רש"י) and Tosafos (תוספות) disagree whether the case involves fire spreading naturally or through external wind (ruach metzuya), yielding different understandings of when one is liable as adam hamazik.
This shiur analyzes the fundamental dispute on Bava Kamma 22a between Rabbi Yochanan and Reish Lakish regarding the nature of liability for fire damage. The Mishna establishes that one pays nezek shalem (full damages) where the animal threw the fire (on the charorah), and chatzi nezek (half damages) on the area it spread (on the gadish). The Gemara (גמרא) asks whether fire damage is categorized as eish mishum ketzio (liability for one's action) or eish mishum mamono (liability for one's property). Rabbi Yochanan argues that fire liability is mishum ketzio—it's your action. He challenges the mamono position by noting that fire travels on its own (eish me'aleha holeches v'doleches lemerochos), so it cannot truly be considered "your property" in any meaningful sense. Reish Lakish contends that it cannot be ketzio because it's not truly your koach—the fire spreads by itself, not by your direct force. Rashi (רש"י) explains that fire has no mamash (tangible substance), which is why there can be no meilah (misappropriation) with the flame of hekdesh, only with the coals. This demonstrates that fire isn't considered owned property in halacha (הלכה).
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Bava Kamma 22a
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