It has been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
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Augustine of Hippo
AD 430
For He who gave the commandment that a writing of divorcement should be given, did not give the commandment that a wife should be put away; but whosoever shall put away, says He, let him give her a writing of divorcement, in order that the thought of such a writing might moderate the rash anger of him who was getting rid of his wife. And, therefore, He who sought to interpose a delay in putting away, indicated as far as He could to hard-hearted men that He did not wish separation.
In all things our Lord and Savior reforms for the better the justice of the ancient law. Indeed, it seems that long ago a license for divorce was granted by Moses on tenuous grounds to the Jewish people who were living licentiously and serving their pleasures. This was due not to the system of law but to the unbridled pleasure of a carnal people unable to uphold the righteousness of the law according to rigorous standards. This concession was allowed, according to what the Lord himself said in another place in his reply to the inquiring Sadducees. For when they asked why Moses had allowed a bill of divorce to be given, the Lord answered, “Moses, by reason of the hardness of your hearts, permitted you to put away your wives, but it was not so from the beginning.” And now, not without good reason does our Lord and Savior, with that license removed, restore the precepts of his former constitution. For he orders that chaste wedlock be preserved by indissoluble law, showing that the law of ...
He goes not on to what lies before Him, until He have well cleared out the former topics. For, lo, He shows us yet another kind of adultery. And what is this? There was an ancient law made, Deuteronomy 24:1-4 that he who hated his wife, for whatever kind of cause, should not be forbidden to cast her out, and to bring home another instead of her. The law however did not command him simply to do this, but after giving the woman a writing of divorcement, that it might not be in her power to return to him again; that so at least the figure of the marriage might remain.
For if He had not enjoined this, but it were lawful first to cast her out, and take another, then afterwards to take back the former, the confusion was sure to be great, all men continually taking each others' wives; and the matter thenceforth would have been direct adultery. With a view to this, He devised, as no small mitigation, the writing of divorcement.
But these things were done by reason of another, a far great...
Moses commanded that if a man hated his wife, he should be separated from her lest anything worse occur." For if he hated her, he might kill her. Moses also commanded that the husband give the divorced woman a writing of divorcement. By this writing she could no longer return to him, thus preventing the confusion that would result if she did so and he was now living with another woman.