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How does a thief actually acquire ownership of stolen property through shinui (change)? The shiur develops two approaches to the mechanism of kinyan geneivah: either the pasuk "ka'asher gazal" teaches that shinui itself transfers ownership, or kinyan geneivah occurs at the moment of theft as a sevara, and shinui merely removes the obligation to return it. A fundamental analysis of Tosafos (תוספות)' position and its implications for understanding the Gemara (גמרא).
This shiur presents an intensive analysis of Bava Kamma 65b, focusing on the fundamental mechanism of how shinui (change in a stolen object) creates kinyan (acquisition) for a thief. Rabbi Zweig begins by testing the students' knowledge of the basic Gemara (גמרא), emphasizing that understanding the shiur requires first having complete mastery of the factual content—who says what, what they're arguing about, and the structure of the sugya. The Gemara discusses a dispute between Rabbi Loi and Rabbi Chanina regarding the price a thief must pay when the stolen animal grows (from a taleh to an ayil). The question centers on when shinui is koneh (effects acquisition). The Gemara brings a proof from the din of esnan (the payment to a harlot, which may not be brought as a korban): "Ta'am ve'lo shinui yam"—if there is a shinui in esnan, it becomes permissible. Tosafos (תוספות) asks a fundamental question: If we already learned from "ta'am ve'lo shinui yam" that shinui works by esnan, why do we need the separate pasuk of "ka'asher gazal" to teach us that shinui is koneh by geneivah? Shouldn't we be able to derive this from esnan?
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Bava Kamma 65b
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