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What makes some custom differences a violation of lo sasgodu while others remain permissible minhagim? The shiur analyzes Yevamos 13b's discussion of Megillah reading times to develop a fundamental chakira: lo sasgodu applies when one community holds another's practice is prohibited, not merely when they follow different customs. This distinction reshapes how we understand legitimate diversity in Jewish practice.
This shiur delivers an intricate analysis of Yevamos 13b, focusing on the Gemara (גמרא)'s application of the principle of lo sasgodu (do not create factions) to the varying times for reading the Megillah established by Chazal. The discussion probes why different communities reading the Megillah on different days—benei kfar on the eleventh, twelfth or thirteenth, benei ayarim on the fourteenth, and mukafei chomah on the fifteenth—might constitute a violation of lo sasgodu, and how the Gemara resolves this apparent problem. Rabbi Zweig opens with a fundamental question: how can there be an issue of lo sasgodu when the Torah (תורה) itself creates different categories with different obligations (Kohen, Levi, Yisrael)? If the Torah establishes these distinctions, what is the violation in having different groups perform the same mitzvah (מצוה) at different times? The class explores whether lo sasgodu applies only when there is a dispute about what the halacha (הלכה) should be, or whether it extends even to situations where everyone agrees on the categorization but the visible practice differs.
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Yevamos 13b
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