'Demons' in the Bible

The rest of mankind, who were not killed with these plagues, didn't repent of the works of their hands, that they wouldn't worship demons, and the idols of gold, and of silver, and of brass, and of stone, and of wood; which can neither see, nor hear, nor walk.

for they are spirits of demons, performing signs; which go forth to the kings of the whole inhabited earth, to gather them together for the war of that great day of God, the Almighty.

He cried with a mighty voice, saying, "Fallen, fallen is Babylon the great, and she has become a habitation of demons, a prison of every unclean spirit, and a prison of every unclean and hateful bird!