1 Thessalonians 4:6

6 and that in this matter no one should wrong or take advantage of a brother or sister.a The Lord will punish all those who commit such sins, as we told you and warned you before.

Read 1 Thessalonians 4:6 Using Other Translations

That no man go beyond and defraud his brother in any matter: because that the Lord is the avenger of all such, as we also have forewarned you and testified.
that no one transgress and wrong his brother in this matter, because the Lord is an avenger in all these things, as we told you beforehand and solemnly warned you.
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.