Revelation 12:12

εὐφραίνεσθε, cf. the Egyptian hymn in honour of Râ, the sun-god: “Râ hath quelled his impious foes, heaven rejoices, earth is delighted”. οὐαὶ κ. τ. λ. This desperate and last effort of Satan is a common apocalyptic feature (cf. e.g., 4 Esd. 13:16 f.; Ap. Bar. xxviii. 3, xli. 1, lxxv. 5; Mark 13:21; Did. xvi.), which John identifies later with the Imperial cultus.

The dragon's pursuit of the woman (Revelation 12:13-17) resumes and expands the hint of Revelation 12:6.