Matthew 5:31 in the King James Version
It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
Context
30 If your right hand causes you to stumble, cut it off, and throw it away from you. For it is more profitable for you that one of your members should perish, than for your whole body to be cast into Gehenna.
31 “It was also said, ‘Whoever shall put away his wife, let him give her a writing of divorce,’
32 but I tell you that whoever puts away his wife, except for the cause of sexual immorality, makes her an adulteress; and whoever marries her when she is put away commits adultery.