Revelation 16:14; Revelation 18:2

Revelation 16:14

14 They are demonic spirits that perform signs, and they go out to the kings of the whole world, to gather them for the battle on the great day of God Almighty.

Revelation 18:2

2 With a mighty voice he shouted: “ ‘Fallen! Fallen is Babylon the Great!’She has become a dwelling for demons and a haunt for every impure spirit, a haunt for every unclean bird, a haunt for every unclean and detestable animal.