1 Thessalonians 4:3, 6
1 Thessalonians 4:3 NASB1995
For this is the will of God, your sanctification; that is, that you abstain from sexual immorality
1 Thessalonians 4:6 NASB1995
and that no man transgress and defraud his brother in the matter because the Lord is the avenger in all these things, just as we also told you before and solemnly warned you.