1 Thessalonians 4:3-8

What God wants is for you to live holy lives. So stay away from sexual immorality in order that each of you may control yourselves in a way that is holy and respectful, not indulging passionate lust like the heathen who have no knowledge of God. Don't cheat or take advantage of another Christian in these matters, for the Lord is the one who executes justice in all such things, as we've already clearly explained to you, and warned you about. For God did not call us to live impure lives, but holy lives. So anyone who rejects this position isn't just rejecting what a human being is saying; they are rejecting God, who gives his Holy Spirit to you.