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What does holech isur isur mean, and when does it work? The shiur develops two distinct mechanisms: (1) when one heter takes effect, a second parallel heter is mutar, and (2) once a heter is chal, no subsequent isur can interfere with what the Torah (תורה) permitted. The Gemara (גמרא)'s shift from "naso meis zachas nos achai" to "naso meis umeis" reveals the limits of the first type—and the power of the second.
Rabbi Zweig delivers an advanced Gemara (גמרא) shiur analyzing the sugya of holech isur isur in Yevamos 6a, developing a fundamental chakira in how this principle operates. The shiur begins by reviewing several unresolved questions from the previous session, including the Argue More's conclusion that holech isur isur requires the heter to be mutar, the figyu of zachas that suddenly transforms a tumei meis into a zav, the Pnei Hasadom's question about chametz dika milk, and the Maggid of Rum's shaila about burning a keili on Yom Tov. The core question addressed is: what is the underlying sevara of holech isur isur? On the surface, the concept appears paradoxical—if the Torah (תורה) permits one thing, how does that automatically permit another? Rabbi Zweig demonstrates that the Gemara's progression from "naso meis zachas nos achai" to "naso meis umeis" is not merely a factual correction, but reveals a fundamental machlokes about how holech isur isur operates.
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Yevamos 6a
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