Adam Clarke on Deuteronomy 24:1

Some uncleanness - Any cause of dislike, for this great latitude of meaning the fact itself authorizes us to adopt, for it is certain that a Jew might put away his wife for any cause that seemed good to himself; and so hard were their hearts, that Moses suffered this; and we find they continued this practice even to the time of our Lord, who strongly reprehended them on the account, and showed that such license was wholly inconsistent with the original design of marriage; see Mat 5:31 (note), etc.; Mat 19:3 (note), etc., and the notes there.