Ver. 5. And Jesus answered and said unto them , etc..] With respect to this command, or sufferance of Moses, which they urged: for the hardness of your heart he wrote you this precept ; it was, not because it was right in its own nature, or according to the original will of God; but, because the Jews were such cruel, and hard hearted men, that if this had not been permitted, some of them, that had wives not so agreeable to them, would have used them in a very inhuman manner, if not murdered them; and therefore to prevent further, and greater mischief, Moses indulged them with such a precept; (see Gill on Matthew 19:8).
Verses 1-12 - Wherever Jesus was, the people flocked after him in crowds, and he taught them. Preaching was Christ's constant practice. He here show that the reason why Moses' law allowed divorce, was such that the ought not to use the permission; it was only for the hardness of their hearts. God himself joined man and wife together; he has fitted them to be comforts and helps for each other. The bond which God has tied, is not to be lightly untied. Let those who are for putting away their wives consider what would become of themselves, if God should deal with them in like manner.