Mark 10:2-12New International Version (NIV)

² Some Pharisees came and tested him by asking, “Is it lawful for a man to divorce his wife?”

³ “What did Moses command you?” he replied.

⁴ They said, “Moses permitted a man to write a certificate of divorce and send her away.”

⁵ “It was because your hearts were hard that Moses wrote you this law,” Jesus replied. ⁶ “But at the beginning of creation God ‘made them male and female.’^{[a] 7} ‘For this reason a man will leave his father and mother and be united to his wife,^{[b] 8} and the two will become one flesh.’^[c] So they are no longer two, but one flesh. ⁹ Therefore what God has joined together, let no one separate.”

¹⁰ When they were in the house again, the disciples asked Jesus about this. ¹¹ He answered, “Anyone who divorces his wife and marries another woman commits adultery against her. ¹² And if she divorces her husband and marries another man, she commits adultery.”