Jamieson, Fausset & Brown

judge angels--namely, bad angels. We who are now "a spectacle to angels" shall then "judge angels." The saints shall join in approving the final sentence of the Judge on them (Jde 1:6). Believers shall, as administrators of the kingdom under Jesus, put down all rule that is hostile to God. Perhaps, too, good angels shall then receive from the Judge, with the approval of the saints, higher honors.