I Thessalonians 4:3, 6
I Thessalonians 4:3 NKJV
For this is the will of God, your sanctification: that you should abstain from sexual immorality
I Thessalonians 4:6 NKJV
that no one should take advantage of and defraud his brother in this matter, because the Lord is the avenger of all such, as we also forewarned you and testified.