For the source text click/tap here: Yevamot 94
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This mishnah deals with a quite complicated situation in which a man marries a series of sisters, thinking that each previous one was dead, and then finds out that they are all alive.
In a braita we learn : None of those with whom relations are forbidden by Torah law require a bill of divorce from him, even if he married them in a proper manner, apart from a married woman who married by mistake by permission of the court. And Rabbi Akiva adds: Also a brother’s wife and a wife’s sister. Since it is possible that these two women could become permitted to him, by levirate marriage in the case of a brother’s wife, or a wife’s sister after his wife’s death, they too require a bill of divorce.
This notion of כׇּל עֲרָיוֹת שֶׁבַּתּוֹרָה leads to explore the notion of incest and talmudic examples derived thereof….