80 Sotah 2/4-6

(4) He may not write upon the tablet and not upon the papyrus and not upon the [unprocessed] animal hide rather upon the scroll, as it says, "in a book" (Numbers 5:23). And he may not write with gum, or with vitriol, or with anything that leaves an impression, rather with ink, as it says: "and blot out" (Numbers 5:23) a writing that can be erased.

(5) To what does she respond 'Amen Amen'? Amen to the curse, Amen to the oath. Amen with regard to this man, Amen with regard to another man. Amen that I did not commit adultery while betrothed, or while married, or while awaiting Levirate marriage, or after being taken [to his house]. Amen that I did not become impure. And if I became impure, may they [the curses] be upon me. R. Meir said: Amen that I did not become impure, Amen that I will not become impure.

(6) Everyone agrees that he may not stipulate with her--not about before she was betrothed and not about after she is divorced. If she secluded herself after [she was divorced], became impure, and after that he remarried her, he may not stipulate with her [about that period]. This is the rule: whenever she engaged in sexual intercourse and she was not forbidden to him, he may not stipulate with her.