Jamieson, Fausset and Brown on 1 John 5:19

19. world lieth in wickedness--rather, "lieth in the wicked one," as the Greek is translated in 1Jo 5:18; 1Jo 2:13, 14; compare 1Jo 4:4; Joh 17:14, 15. The world lieth in the power of, and abiding in, the wicked one, as the resting-place and lord of his slaves; compare "abideth in death," 1Jo 3:14; contrast 1Jo 5:20, "we are in Him that is true." While the believer has been delivered out of his power, the whole world lieth helpless and motionless still in it, just as it was; including the wise, great, respectable, and all who are not by vital union in Christ.