Rashi on Exodus 22:16/רש"י על שמות כ״ב:ט״ז

1כמהר הבתולת AS THE MARRIAGE PRICE OF THE VIRGINS — which is limited to fifty shekels in the case of one who outrages a virgin, for it is said, (Deuteronomy 22:29) “Then the man that lay with her shall give unto the damsel’s father fifty shekels of silver” (Mekhilta; Ketubot 10a).