Reference for Ketubot 106:7

ואיכא דאמרי אמר ליה משמע לא שמיע לי מסברא אית לה כיון דלא קים ליה בגוה לא שדי זוזי בכדי אמר ליה אי משמע לא שמיע לך מסברא לית לה כיון דאירסה לא ניחא ליה דתיתזיל:

Others say: He said: I have not actually heard it, but it may logically be concluded that she is entitled [to maintenance]; since her future husband is not sure [he will end up marrying her] he would not throw away money for nothing. The other replied: If you have not actually heard this it may logically be concluded that she is not entitled to maintenance, because [her future husband], having betrothed her, would not allow her to be degraded.

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