Yevamot 88: The Original Agunot
How stringent are the standards of accepting the testimony of those who testify that a woman's husband has died? There are advantages and disadvantages to being "lenient" and accepting one witness's account, for example, depending on whether complications develop later, like that testimony turning out to have been wrong. Which leads to a discussion about witnesses in general, and their reliability. Also, a beraita on the case of a prohibited woman... With possible cases including kohanim, of course, and testimony about the husband having died. There are times the decision will be stringent…
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