Matthew 19:6-9

King James Version

⁶ Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.

⁷ They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?

⁸ He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.

⁹ And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.