וְ֠נָתַן הָאִ֨ישׁ הַשֹּׁכֵ֥ב עִמָּ֛הּ לַאֲבִ֥י הנער [הַֽנַּעֲרָ֖ה] חֲמִשִּׁ֣ים כָּ֑סֶף וְלֽוֹ־תִהְיֶ֣ה לְאִשָּׁ֗ה תַּ֚חַת אֲשֶׁ֣ר עִנָּ֔הּ לֹא־יוּכַ֥ל שַׁלְּחָ֖ה כָּל־יָמָֽיו׃ (ס)
then the man that lay with her shall give unto the damsel’s father fifty shekels of silver, and she shall be his wife, because he hath humbled her; he may not put her away all his days.
Sefer HaChinukh
The commandment on the rapist to marry the one he has raped: That we have been commanded that one who rapes a virgin maiden must marry her as a wife and that he must give to her father fifty silver [shekel-coins], as it states (Deuteronomy 22:29), "And the man who lays with her shall pay the maiden's father fifty [coins of] silver."
Sefer HaChinukh
That he not divorce her all of his days: That the rapist is forever prevented from divorcing the one he raped. And about this is it stated (Deuteronomy 22:29), "because he has violated her, he cannot send her away all of his days."