then the man who lay with her must pay the young woman’s father fifty shekels of silver, and she must become his wife because he has violated her. He must not divorce her as long as he lives.
These laws relate to the seventh commandment, laying a restraint by laying a penalty upon those fleshly lusts which war against the soul. I. If a man, lusting after another woman, to get rid of his wife slander her and falsely accuse her, as not having the virginity she pretended to when he married her, upon the disproof of his slander he must be punished, Deu 22:13-19.
Commenting on Deuteronomy 22:13-30
A man shall not take his father's wife,.... Not marry her, whether his own mother, or a stepmother; or even, as Aben Ezra thinks, anyone that was deflowered by his father. Jarchi interprets it of his father's brother's wife, which he was obliged to marry by virtue of the law in Deu 25:5.
Deu 22:28-29 The last case: if a virgin was not betrothed, and a man seized her and lay with her, and they were found, i.e., discovered or convicted of their deed, the man was to pay the father of the girl fifty shekels of silver, for the reproach brought upon him and his house, and to marry the girl whom he had humbled, without ever being able to divorce her.
Commenting on Deuteronomy 22:28-29