Mark 10:6-12

But from the beginning of the creation, God made them male and female. For this cause a man will leave his father and mother, and will join to his wife, and the two will become one flesh, so that they are no longer two, but one flesh. What therefore God has joined together, let no man separate.” In the house, his disciples asked him again about the same matter. He said to them, “Whoever divorces his wife and marries another commits adultery against her. If a woman herself divorces her husband and marries another, she commits adultery.”