Reference for Ketubot 106:6

אמר ליה אם משמע לא שמיע לך מסברא אית לה כיון דלא קים ליה בגוה לא שדי זוזי בכדי

He said back: If you have not actually heard this it may logically be concluded that she is entitled, since her future husband is not sure [he will end up marrying her] he would not throw away money for nothing.

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