'Unclean Spirit' in the Bible

and I saw come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits like frogs --

and he did cry in might -- a great voice, saying, 'Fall, fall did Babylon the great, and she became a habitation of demons, and a hold of every unclean spirit, and a hold of every unclean and hateful bird,