Matthew 5:31,32

Ver 31. "It hath been said, 'Whosoever shall put away his wife, let him give her a writing of divorcement:' 32. But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery."

Gloss, non occ.: The Lord had taught us above that our neighbour's wife was not to be coveted, He now proceeds to teach that our own wife is not to be put away.

Jerome: For touching Moses' allowance of divorce, the Lord and Saviour more fully explains in conclusion, that it was because of the hardness of the hearts of the husbands, not so much sanctioning discord, as checking bloodshed.

Pseudo-Chrys.: For when Moses brought the children of Israel out of Egypt, they were indeed Hebrews in race, but Egyptians in manners. And it was caused by the Gentile manners that the husband hated the wife; and if he was not permitted to put her away, he was ready either to kill her or ill-treat her. Moses therefore suffered a bill of divorcement, not because it was a good practice in itself, but was the prevention of a worse evil.

Hilary: But the Lord who brought peace and goodwill on earth, would have it reign especially in the matrimonial bond.

Aug., cont. Faust., xix, 26: The Lord's command here that a wife is not to be put away, is not contrary to the command in the Law, as Manichaeus affirmed. Had the Law allowed any who would to put away his wife, to allow none to put away were indeed the very opposite of that. But the difficulty which Moses is careful to put in the way, shews that he was no good friend to the practice at all. For he required a bill of divorcement, the delay and difficulty of drawing out which would often cool headlong rage and disagreement, especially as by the Hebrew custom, it was the Scribes alone who were permitted to use the Hebrew letters, in which they professed a singular skill.

To these then the law would send him whom it bid to give a writing of divorcement, when he would put away his wife, who mediating between him and his wife, might set them at one again, unless in minds too wayward to be moved by counsels of peace. Thus then He neither completed, by adding words to it, the law of them of old time, nor did He destroy the Law given by Moses by enacting things contrary to it, as Manichaeus affirmed; but rather repeated and approved all that the Hebrew Law contained, so that whatever He spoke in His own person more than it had, had in view either explanation, which in divers obscure places of the Law was greatly needed, or the more punctual observance of its enactments.

Aug., Serm. in Mont., i, 14: By interposing this delay in the mode of putting away, the lawgiver shewed as clearly as it could be shewn to hard hearts, that he hated strife and disagreement. The Lord then so confirms this backwardness in the Law, as to except only one case, "the cause of fornication;" every other inconvenience which may have place, He bids us bear with patience in consideration of the plighted troth of wedlock.

Pseudo-Chrys.: If we ought to bear the burdens of strangers, in obedience to that of the Apostles, "Bear ye one another's burdens," [Galatians 6:2] how much more that of our wives and husbands? The Christian husband ought not only to keep himself from any defilement, but to be careful not to give others occasion of defilement; for so is their sin imputed to him who gave the occasion. Whoso then by putting away his wife gives another man occasion of committing adultery, is condemned for that crime himself.

Aug.: Yea, more, He declares the man who marries her who is put away an adulterer.

Chrys.: Say not here, It is enough her husband has put her away; for even after she is put away she continues the wife of him that put her away.

Aug.: The Apostle has fixed the limit here, requiring her to abstain from a fresh marriage as long as her husband lives. After his death he allows her to marry. But if the woman may not marry while her former husband is alive, much less may she yield herself to unlawful indulgences. But this command of the Lord, forbidding to put away a wife, is not broken by him who lives with her not carnally but spiritually, in that more blessed wedlock of those that keep themselves chaste.

A question also here arises as to what is that fornication which the Lord allows as a cause of divorce; whether carnal sin, or, according to the Scripture use of the word, any unlawful passion, as idolatry, avarice, in short all transgression of the Law by forbidden desires. For if the Apostle permits the divorce of a wife if she be unbelieving, (though indeed it is better not to put her away,) and the Lord forbids any divorce but for the cause of fornication, unbelief even must be fornication. And if unbelief be fornication, and idolatry unbelief, and covetousness idolatry, it is not to be doubted that covetousness is fornication. And if covetousness be fornication, who may say of any kind of unlawful desire that it is not a kind of fornication?

Aug., Retract., i, 19, 6: Yet I would not have the reader think this disputation of ours sufficient in a matter so arduous; for not every sin is spiritual fornication, nor does God destroy every sinner, for He hears His saints daily crying to Him, "Forgive us our debts;" but every man who goes a whoring and forsakes Him, him He destroys.

Whether this be the fornication for which divorce is allowed is a most knotty question - for it is no question at all that it is allowed for the fornication by carnal sin.

Aug., lib. 83, Quaest. q. ult.: If any affirm that the only fornication for which the Lord allows divorce is that of carnal sin, he may see that the Lord has spoken of believing husbands and wives, forbidding either to leave the other except for fornication.

Aug., Serm. in Mont., i, 16: Not only does He permit to put away a wife who commits fornication, but whoso puts away a wife by whom he is driven to commit fornication, puts her away for the cause of fornication, both for his own sake and hers.

Aug., de Fid. et Op. 16: He also rightly puts away his wife to whom she shall say, I will not be your wife unless you get me money by robbery; or should require any other crime to be done by him. If the husband here be truly penitent, he will cut off the limb that offends him.

Aug., Serm. in Mont., i, 16: Nothing can be more unjust than to put away a wife for fornication, and yourself to be guilty of that sin, for then is that happened, "Wherein thou judgest another, thou condemnest thyself." [Romans 2:1] When He says, "And he who marrieth her who is put away, committeth adultery," a question arises, does the woman also in this case commit adultery? For the Apostle directs either that she remain unmarried, or be reconciled to her husband. There is this difference in the separation, namely, which of them was the cause of it. If the wife put away the husband and marry another, she appears to have left her first husband with the desire of change, which is an adulterous thought. But if she have been put away by her husband, yet he who marries her commits adultery, how can she be quit of the same guilt? And further, if he who marries her commits adultery, she is the cause of his committing adultery, which is what the Lord is here forbidding.