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Why does the Mishna use "patur" (exempt) instead of "asur" (forbidden) when describing ervah's exemption from yibum? The shiur analyzes the Gemara (גמרא)'s dialectic: "patur" might misleadingly suggest voluntary yibum is permitted, while "asur" might wrongly imply she's forbidden even outside the mitzvah (מצוה) context. The resolution hinges on which formulation better captures that she's excluded *because* she's an ervah, not merely exempt from a mitzvah.
The shiur begins by analyzing the structure of the Mishna in Yevamos, which lists various arayos (forbidden relations) who are exempt from yibum. A foundational question emerges: the Gemara (גמרא) states that we learn the entire din of arayos being exempt from yibum from "achos isha" (one's wife's sister). Rashi (רש"י) explains that we don't learn this from "ervah lo tzorech kra" (the general principle that an ervah doesn't require a verse) alone. Rather, the fact that achos isha "poteres tzarah" (exempts the co-wife) teaches us that ervah herself is entirely excluded from yibum. The logic works backward: if she weren't herself excluded, she couldn't exempt the tzarah. This becomes the source for understanding that ervah is patur (exempt) from yibum entirely. This raises the Gemara's central question: if we learn everything from achos isha, why doesn't the Mishna begin with achos isha first? The shiur explores several possible answers. One approach follows the principle that we should start with what is explicit in the Torah (תורה), since Torah she'b'al peh (Oral Law) is a commentary on Torah she'b'ksav (Written Law). Therefore, what appears clearly in the written text should be codified first. However, the Gemara offers a different answer: "ki chatzei matanah chumra chumra noka" - perhaps the Mishna starts with the more severe prohibitions first, those punishable by serefah (burning).
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Yevamos 3a
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