Reference for Ketubot 23:4

אמר רבה זאת אומרת כנסה בחזקת בתולה ונמצאת בעולה כתובתה מנה רב אשי אמר לעולם אימא לך בעלמא לית לה כלל ושאני הכא שהרי נכנסה לחופה

Rabbah said: This means that if he married her in the presumption that she was a virgin and she was found to have had intercourse she gets a ketubah of a maneh. Ashi said: In general I could say to you that she receives nothing; but it is different here, because the first one had married her.

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