Bava Batra 135: Ineffectual Deathbed Documents
When a man is dying, they ask him in a roundabout way whether his wife will be subject to yibum. When he says she could marry a kohen gadol means she doesn't have any need for yibum. But what about when a man comes to divorce his wife, he is considered reliable with regard to his wife's status - sometimes! Sometimes, he is explicitly "not believed" with regard to his wife's status. Which leads to a serious discussion about protecting the women, and also held in a respectful manner that allowed for different opinions. Also, if a will is written on one's deathbed and not yet given to anyone…
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