Matthew 19:3-9
3 Some Pharisees came to him to test him. They asked, “Is it lawful for a man to divorce his wife for any and every reason?”
4 “Haven’t you read,” he replied, “that at the beginning the Creator ‘made them male and female,’
5 and said, ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh’?
6 So they are no longer two, but one. Therefore what God has joined together, let man not separate.”
7 “Why then,” they asked, “did Moses command that a man give his wife a certificate of divorce and send her away?”
8 Jesus replied, “Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning.
9 I tell you that anyone who divorces his wife, except for marital unfaithfulness, and marries another woman commits adultery.”