Mark 10:2-9

At one point, some of the Pharisees came, seeking to entrap him with a question. “Tell us,” they asked, “is it lawful for a man to divorce his wife?” He answered them, “What did Moses command you?” They replied, “Moses permitted us to write a certificate of separation that would be valid to complete a divorce.” Jesus said, “Yes, Moses wrote this exception for you because you are hardhearted. But from the beginning God created male and female. For this reason a man will leave his parents and be wedded to his wife. And the husband and wife will be joined as one flesh, and after that they no longer exist as two, but one flesh. So there you have it. What God has joined together, no one has the right to split apart.”