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Why does the Gemara (גמרא)'s proof that asei docheh lo sa'aseh employ different types of pirchos when learning from one source versus from two? The shiur develops a three-tier chakira: chad me'chad means the asei itself is stronger than the lo sa'aseh; ma'ad sa'ad (two sources) means the lo sa'aseh was restricted from the start; and learning from three means the din is weaker still—less than fully reasoned, more halachic necessity.
This Gemara (גמרא) shiur on Yevamos 5b tackles one of the most nuanced sugyos in Shas regarding the principle of asei docheh lo sa'aseh—that a positive commandment can override a negative one. The shiur begins by noting a structural oddity: why does the Gemara take a circuitous route through various proofs before arriving at the clearest example—milah docheh Shabbos (שבת), a lo sa'aseh she'yesh bo kares? The Gemara could have begun immediately with that proof instead of first establishing the principle of asei docheh lo sa'aseh grade then (in general) through Rosh Hashanah's shofar. Rabbi Zweig's central insight is that the Gemara's structure is not haphazard but reflects fundamentally different modes of limud (derivation). He proposes a three-tier chakira—a conceptual analysis—of how pirchos (refutations) function differently depending on whether we learn from one source (chad me'chad, a binyan av), two sources (ma'ad sa'ad), or more. This chakira is not explicitly stated by the Gemara but emerges from the pattern of questions and answers throughout the sugya.
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Yevamos 5b
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