'Demons' in the Bible

The rest of mankind, who were not killed by these plagues, did not repent even then of the works of their hands, so as to cease worshiping and paying homage to the demons and the idols of gold and of silver and of bronze and of stone and of wood, which can neither see nor hear nor walk;

for they are [actually] the spirits of demons, performing [miraculous] signs. And they go out to the kings of the entire inhabited earth, to gather them together for the war of the great day of God, the Almighty.

And he shouted with a mighty voice, saying, “Fallen, fallen [certainly to be destroyed] is Babylon the great! She has become a dwelling place for demons, a dungeon haunted by every unclean spirit, and a prison for every unclean and loathsome bird.