Mark 10:2-9

Pharisees came to Jesus to test Him [intending to trick Him into saying something wrong], and asked Him, “Is it lawful [according to Scripture] for a man to divorce his wife and send her away?” He replied to them, “What did Moses command you?” They said, “Moses allowed a man TO WRITE A CERTIFICATE OF DIVORCE AND TO SEND HER AWAY.” [Deut 24:1-4] 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].”