Matthew 19:8-10

He saith unto them, Moses for your hardness of heart suffered you to put away your wives: but from the beginning it hath not been so. And I say unto you, Whosoever shall put away his wife, except for fornication, and shall marry another, committeth adultery: and he that marrieth her when she is put away committeth adultery. The disciples say unto him, If the case of the man is so with his wife, it is not expedient to marry.