Augustine of Hippo
Catena Aurea · Matthäusevangelium 19
And it came to pass, that when Jesus had finished these sayings, he departed from Galilee, and came into the coasts of Judæa beyond Jordan; And great multitudes followed him; and he healed them there. The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause? And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female, And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder. They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away? He said unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
(ubi sup.) For how great was that hardness! When not even the intervention of a bill of divorce, which gave room for just and prudent men to endeavour to dissuade, could move them to renew the conjugal affection. And with what wit do the Manichæans blame Moses, as severing wedlock by a bill of divorce, and commend Christ as, on the contrary, confirming its force? Whereas according to their impious science they should have praised Moses for putting asunder what the devil had joined, and found fault with Christ who riveted the bonds of the devil.