This is that permission which the Pharisees erroneously referred to as a precept, Mat 19:7, Moses commanded to give a writing of divorcement. It was not so; our Saviour told them that he only suffered it because of the hardness of their hearts, lest, if they had not had liberty to divorce their wives, they should have ruled them with rigour, and it may be, have been the death of them. It is probable that divorces were in use before (they are taken for granted, Lev 21:14), and Moses thought it needful here to give some rules concerning them. 1. That a man might not divorce his wife unless he found some uncleanness in her, Deu 24:1. It was not sufficient to say that he did not like her, or that he liked another better, but he must show cause for his dislike; something that made her disagreeable and unpleasant to him, though it might not make her so to another. This uncleanness must mean something less than adultery; for, for that, she was to die; and less than the suspicion of it, for in that case he might give her the waters of jealousy; but it means either a light carriage, or a cross froward disposition, or some loathsome sore or disease; nay, some of the Jewish writers suppose that an offensive breath might be a just ground for divorce. Whatever is meant by it, doubtless it was something considerable; so that their modern doctors erred who allowed divorce for every cause, though ever so trivial, Mat 19:3. 2. That it must be done, not by word of mouth, for that might be spoken hastily, but by writing, and that put in due form, and solemnly declared, before witnesses, to be his own act and deed, which was a work of time, and left room for consideration, that it might not be done rashly. 3. That the husband must give it into the hand of his wife, and send her away, which some think obliged him to endow her and make provision for her, according to her quality and such as might help to marry her again; and good reason he should do this, since the cause of quarrel was not her fault, but her infelicity. 4. That being divorced it was lawful for her to marry another husband, Deu 24:2. The divorce had dissolved the bond of marriage as effectually as death could dissolve it; so that she was as free to marry again as if her first husband had been naturally dead. 5. That if her second husband died, or divorced her, then still she might marry a third, but her first husband should never take her again (Deu 24:3, Deu 24:4), which he might have done if she had not married another; for by that act of her own she had perfectly renounced him for ever, and, as to him was looked upon as defiled, though not as to another person. The Jewish writers say that this was to prevent a most vile and wicked practice which the Egyptians had of changing wives; or perhaps it was intended to prevent men's rashness in putting away their wives; for the wife that was divorced would be apt, in revenge, to marry another immediately, and perhaps the husband that divorced her, how much soever he though to better himself by another choice, would find the next worse, and something in her more disagreeable, so that he would wish for his first wife again. "No" (says this law) "you shall not have her, you should have kept her when you had her." Note, It is best to be content with such things as we have, since changes made by discontent often prove for the worse. The uneasiness we know is commonly better, though we are apt to think it worse, than that which we do not know. By the strictness of this law God illustrates the riches of his grace in his willingness to be reconciled to his people that had gone a whoring from him. Jer 3:1, Thou hast played the harlot with many lovers, yet return again to me. For his thoughts and ways are above ours.

Her former husband which sent her away may not take her again to be his wife,.... Though ever so desirous of it, and having heartily repented that he had put her away: this is the punishment of his fickleness and inconstancy, and was ordered to make men cautious how they put away their wives; since when they had so done, and they had been married to another, they could not enjoy them again even on the death of the second husband; yea, though she was only espoused to him, and he had never lain with her, as Ben Melech observes, it was forbidden the former husband to marry her; though if she had only played the whore, according to the same writer, and others (a), she might return to him:

after that she is defiled; not by whoredom, for in that case she was not forbidden, as it is interpreted, but by her being married to another man; when she was defiled, not by him, or with respect to him, nor with regard to any other man, whom she might lawfully marry after the decease of her latter husband; but with respect to her first husband, being by her divorce from him, and by her marriage to another, entirely alienated and separated from him, and so prohibited to him; and thus R. Joseph Kimchi interprets this defilement of prohibition, things prohibited being reckoned unclean, or not lawful to be used:

for that is abomination before the Lord; for a man to take his wife again, after she had been divorced by him, and married to another man; and yet, such is the grace and goodness of God to his backsliding people, that he receives them when they return unto him their first husband, and forsake other lovers, Jer 3:1,

and thou shalt not cause the land to sin which the Lord thy God giveth thee for an inheritance; since if this was allowed, that men might put away their wives, and take them again at pleasure, and change them as often as they thought fit, no order could be observed, and the utmost confusion in families introduced, and lewdness encouraged, and which would subject the land and the inhabitants of it to many evils and calamities, as the just punishment thereof.

(a) Maimon. & Bartenora in Misn. Sotah, c. 2. sect. 6.