1 When a man hath taken a wife, and married her, and it come to pass that she find no favour in his eyes, because he hath found some uncleanness in her: then let him write her a bill of divorcement, and give it in her hand, and send her out of his house.
[AD 430] Augustine of Hippo on Deuteronomy 24:1
The Lord explains the intention of the law, which required a bill of divorce in every case where a wife was put away. The precept not to put away a wife is the opposite of saying that a man may put away his wife if he pleases, which is not what the law says. On the contrary, to prevent the wife from being put away, the law required this intermediate step, that the eagerness for separation might be checked by the writing of this bill and the man might have time to think of the evil of putting away his wife.