Mark 10:5-9

But Jesus said to them, “Because of your hardness of hearts [your callousness and insensitivity toward your wives and the provision of God] he wrote you this precept. But from the beginning of creation God MADE THEM MALE AND FEMALE. [Gen 1:27; 5:2] FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND HIS MOTHER [to establish a home with his wife], [Matt 19:5] AND THE TWO SHALL BECOME ONE FLESH; so that they are no longer two, but [are united as] one flesh. [Gen 2:24] Therefore, what God has united and joined together, man must not separate [by divorce].”