1 Thessalonians 4:3-6

God’s will is for you to be holy, so stay away from all sexual sin. Then each of you will control his own body and live in holiness and honor— not in lustful passion like the pagans who do not know God and his ways. Never harm or cheat a fellow believer in this matter by violating his wife, for the Lord avenges all such sins, as we have solemnly warned you before.