Thou shalt not commit adultery.
Matthew 5:28But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Romans 13:13Let us walk honestly, as in the day; not in rioting and drunkenness, not in chambering and wantonness, not in strife and envying.
1 Corinthians 6:18Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
1 Corinthians 7:1Now concerning the things whereof ye wrote unto me: It is good for a man not to touch a woman.
1 Corinthians 7:7For I would that all men were even as I myself. But every man hath his proper gift of God, one after this manner, and another after that.
Ephesians 5:3But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
Colossians 3:5Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
1 Thessalonians 4:3For this is the will of God, even your sanctification, that ye should abstain from fornication:
1 Thessalonians 4:7For God hath not called us unto uncleanness, but unto holiness.
Hebrews 13:4Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.