Matthew 19:6-8

Darby Translation

⁶ so that they are no longer two, but one flesh. What therefore God has joined together, let not man separate.

⁷ They say to him, Why then did Moses command to give a letter of divorce and to send [her] away?

⁸ He says to them, Moses, in view of your hardheartedness, allowed you to put away your wives; but from the beginning it was not thus.