2 Thessalonians 3:3

But the Lord is faithful, who shall establish you, and guard you from the evil one. [Evidently Paul, while at Corinth, met with some of the false brethren of whom he speaks (2 Corinthians 11:13; 2 Corinthians 11:26). These refused to be moved by argument or persuasion, and were evil and without faith; that is, faithless, insincere, as the word means at Matthew 23:23; Titus 2:10. These false brethren no doubt added greatly to Paul's distress, though he was already suffering, or about to suffer, persecution at the hands of the Jews (Acts 18:12). In asking prayers for deliverance from these, Paul joyfully pauses to contrast this his fellowship with false brethren, with the condition of the Thessalonians who were in the fellowship of that faithful God who would establish them and guard them from the evil one.]