Here are 12 Bible verses about affairs from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Hebrews 13:4 KJV
Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
Matthew 5:32 KJV
But 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.
Proverbs 28:13 KJV
But 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.
Matthew 5:28 KJV
He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.
Ephesians 5:25 KJV
But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Isaiah 47:10 KJV
Husbands, love your wives, even as Christ also loved the church, and gave himself for it;
Proverbs 2:16-22 KJV
For thou hast trusted in thy wickedness: thou hast said, None seeth me. Thy wisdom and thy knowledge, it hath perverted thee; and thou hast said in thine heart, I am, and none else beside me.
John 8:34 KJV
To deliver thee from the strange woman, even from the stranger which flattereth with her words; Which forsaketh the guide of her youth, and forgetteth the covenant of her God. For her house inclineth unto death, and her paths unto the dead. None that go unto her return again, neither take they hold of the paths of life. That thou mayest walk in the way of good men, and keep the paths of the righteous. For the upright shall dwell in the land, and the perfect shall remain in it. But the wicked shall be cut off from the earth, and the transgressors shall be rooted out of it.
2 Corinthians 10:3-5 KJV
Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin.
Galatians 5:1 KJV
For though we walk in the flesh, we do not war after the flesh: (For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;) Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;
1 Corinthians 6:18 KJV
Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage.
Proverbs 27:5 KJV
Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
Revelation 3:6 KJV
Open rebuke is better than secret love.