For the source text click/tap here: Yevamot 91
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The Mishnah (87b) states that when a woman marries another man under the assumption that her first husband died abroad, and then her first husband returns alive, she is prohibited to both men. The Mishnah adds that if either man dies with no children, the brother of that man must perform Chalitzah with the woman, and he may not perform Yibum.
The Gemara explains that the brother of the first husband must perform Chalitzah because he is the brother of her real husband, and thus the Mitzvah d'Oraisa to perform Chalitzah or Yibum takes effect. He cannot perform Yibum, however, because the Rabanan penalized the woman and gave her the status of a Sotah mid'Rabanan (a Sotah, or woman who is suspected of being unfaithful to her husband, may not do Yibum when her husband dies). The brother of the second husband performs Chalitzah only mid'Rabanan; mid'Oraisa there is no need for Chalitzah since the second husband was never really married to her.
The Gemara adds that for the brother of the second husband, Yibum is "not mid'Oraisa [because she was not really married to the second husband], and not mid'Rabanan [because the Rabanan do not allow her to marry the brother of the second husband].”
One of the arguments that is made on behalf of a woman who received permission from the beit din to remarry, only to discover that her husband was still alive, is presented by Rav Sheshet.
The argument is a simple one – mai havei lah le-me’evad? – what could she possibly have done to protect herself?
The daf proceeds to kvetch reasons the we need to still punish her….
We explore the testimony and value of women’s eidus…