Matthew 5:30-34
30And if thy right hand offend thee, cut if off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
31It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
32But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
33Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:
34But I say unto you, Swear not at all; neither by heaven; for it is God's throne:
(KJV)