Matthew 5:28
but I say to you, that every one who looks upon a woman, to lust after her, already committed adultery with her in his heart.
1 Corinthians 6:9-11
Or know ye not that the unrighteous shall not inherit the Kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with men,
1 Corinthians 10:20
Nay, but I say that the things which the gentiles sacrifice, they sacrifice to demons, and not to God; and I do not wish you to become partakers with the demons.
Galatians 5:19-21
Now the works of the flesh are manifest, which are, fornication, uncleanness, lasciviousness,
Hebrews 13:4
Let marriage be held in honor among all, and let the bed be undefiled; for fornicators and adulterers God will judge.