Matthew 5:31

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 infidelity. But while one school of interpreters (that of Shammai) explained this quite correctly, as prohibiting divorce in every case save that of adultery, another school (that of HILLEL) stretched the expression so far as to include everything in the wife offensive or disagreeable to the husband--a view of the law too well fitted to minister to caprice and depraved inclination not to find extensive favor. And, indeed, to this day the Jews allow divorces on the most frivolous pretexts. It was to meet this that our Lord uttered what follows:

This chapter, and the two that follow it, are a sermon; a famous sermon; the sermon upon the mount. It is the longest and fullest continued discourse of our Saviour that we have upon record in all the gospels. It is a practical discourse; there is not much of the credenda of Christianity in it - the things to be believed, but it is wholly taken up with the agenda - the things to be done; these Christ began with in his preaching; for if any man will do his will, he shall know of the doctrine, whether it be of God. The circumstances of the sermon being accounted for (Mat 5:1, Mat 5:2), the sermon itself follows, the scope of which is, not to fill our heads with notions, but to guide and regulate our practice. I. He proposes blessedness as the end, and gives us the character of those who are entitled to blessedness (very different from the sentiments of a vain world), in eight beatitudes, which may justly be called paradoxes (Mat 5:3-12). II. He prescribes duty as the way, and gives us standing rules of that duty. He directs his disciples, 1. To understand what they are - the salt of the earth, and the lights of the world (Mat 5:13-16). 2. To understand what they have to do - they are to be governed by the moral law. Here is, (1.) A general ratification of the law, and a recommendation of it to us, as our rule (Mat 5:17-20). (2.) A particular rectification of divers mistakes; or, rather, a reformation of divers wilful, gross corruptions, which the scribes and Pharisees had introduced in their exposition of the law; and an authentic explication of divers branches which most needed to be explained and vindicated (Mat 5:20). Particularly, here is an explication, [1.] Of the sixth commandment, which forbids murder (Mat 5:21-26). [2.] Of the seventh commandment, against adulter…

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).