No one should sin against or take advantage of his brother in this matter, because the Lord is the avenger in all these things, as indeed we told (proeipamen | προείπαμεν | aor act ind 1 pl) you beforehand (proeipamen | προείπαμεν | aor act ind 1 pl) with solemn warning.
Reference
1 Thessalonians 4:6
Sequence
9