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When can we derive one legal obligation from another through a kal v'chomer? The shiur analyzes the principle of "ein onshin min hadin" (we don't punish based on logical inference) and shows that the restriction applies only to qualitative differences—cases where the severity changes the nature of the prohibition—not merely quantitative differences where consequences increase but the fundamental wrongdoing remains the same.
The shiur presents a deep analysis of the Talmudic principle of "ein onshin min hadin"—the rule that we cannot derive punishments through logical inference (kal v'chomer)—focusing on when this restriction applies and when it does not. The discussion centers on Bava Kamma 2a and Tosfos's question about why the Mishna presents its teaching in a particular order, and why certain logical inferences are blocked while others are permitted. The shiur begins with Tosfos's technical question: Why doesn't the Mishna say that you cannot learn one category of damages (like fire or pit) from another in both directions? Tosfos explains the Mishna's structure—why certain comparisons are stated and others are not—but then raises a fundamental question: the Mishna seems to suggest "ein onshin min hadin," yet this appears to contradict the Mechilta which explicitly states this principle. Moreover, Tosfos raises this question in an unusual place, seemingly unrelated to kal v'chomer reasoning.
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Bava Kamma 2a
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