Hebrews 13:4
Marriage is honorable in all, and the bed undefiled: but fornicators and adulterers God will judge.
Topicalbible.org—AKJV

1 Corinthians 6:18
Flee fornication. Every sin that a man does is without the body; but he that commits fornication sins against his own body.
Topicalbible.org—AKJV