Matthew 5:31

“It hath been said, etc.] It is not added here, as in the former instances, “by them of old time”; nor prefaced with these words, “ye have heard”; because the case of divorce was not any law of Moses, or of God by him; but only a permission, because of the hardness of the hearts of the Jews: and as to the controversy, about the causes of divorce, this was not debated by them of old time, but was a new thing, just started in the time of Christ; and was a controversy then agitating, between the schools of Hillell and Shammai: the one allowing it upon any frivolous cause; the other, only on account of adultery. Whosoever shall put away his wife, dissolve the marriage bond, dismiss her from his…”

“It hath been said--This shortened form was perhaps intentional, to mark a transition from the commandments of the Decalogue to a civil enactment on the subject of divorce, quoted from Deu 24:1. The law of divorce--according to its strictness or laxity--has so intimate a bearing upon purity in the married life, that nothing could be more natural than to pass from the seventh commandment to the loose views on that subject then current. Whosoever shall put away his wife, let him give her a writing of divorcement--a legal check upon reckless and tyrannical separation. The one legitimate ground of divorce allowed by the enactment just quoted was "some uncleanness"--in other words, conjugal…”

“It hath been said ... - That is, by Moses, Deuteronomy 24:1-2. The husband was directed, if he put his wife away, to give her a bill of divorce, that is a certificate of the fact she had been his wife, and that he had dissolved the marriage. There was considerable difference of opinion among the Jews for what causes the husband was permitted to do this. One of their famous schools maintained that it might be done for any cause, however trivial. The other maintained that adultery only could justify it. The truth was, however, that the husband exercised this right at pleasure; that he was judge in the case, and dismissed his wife when and for what cause he chose. And this seems to be agreeable…”

“Let him give her a writing of divorce - Which the scribes and Pharisees allowed men to do on any trifling occasion. Deu 24:1; Mat 19:7; Mar 10:2; Luk 16:18. Matthew 5:32”

“5:31-32 Jesus challenges the misapplication of the Old Testament provision for divorce (see Deut 24:1-4; cp. Matt 19:3-9): Following the rules does not make divorce acceptable. Jesus allows only one legitimate reason for divorce, sexual infidelity, and forbids casual divorce (see also 1 Cor 7:10-11). 5:31 A notice of divorce is a document stating the legality of a divorce. Evidence suggests that such a document permitted remarriage. “The essential formula in the notice of divorce is, ‘Lo, you are free to marry any man.’ . . . The essential formula in a writ of emancipation is, ‘Lo, you are a freedwoman: lo, you belong to yourself’” (Mishnah Gittin 9:3).”

“whosoever: Mat 19:3, Mat 19:7; Deu 24:1-4; Jer 3:1; Mar 10:2-9 Matthew 5:32”