Mt 19:3-12
‘Some Pharisees approached him, and to put him to the test they said, ‘Is it against the Law for a man to divorce his wife on any pretext whatever?’ He answered, ‘Have you not read that the Creator from the beginning made them male and female and that he said: This is why a man leaves his father and mother and becomes attached to his wife, and the two become one flesh? They are no longer two, therefore, but one flesh.