1 Thessalonians 5:22 - Ellicott's Commentary On The Whole Bible

Abstain from all appearance of evil. — This translation cannot stand. Possibly it might be rendered “every form of evil,” but the most natural version would be, “Hold yourselves aloof from every evil kind” — i.e., evil kind of whatever you may be testing. The word “evil” is here used in the moral sense, and does not constitute an exact antithesis to the “good” of the preceding verse.