John Chrysostom — as excerpted in the Catena Aurea on Matthew 19:1-8

“Had the Lord been opposed to the Old Testament, He would not thus have contended in Moses’ behalf, nor have gone about to shew that what was his was in agreement with the things of old. But the unspeakable wisdom of Christ made answer and excuse for these in this manner, He saith unto them, Moses for the hardness of your hearts suffered you to put away your wives. By this He clears Moses from their charge, and retorts it all upon their own head.”