'Unclean Spirit' in the Bible

And I saw out of the mouth of the dragon, and out of the mouth of the wild beast, and out of the mouth of the false prophet, three unclean spirits like frogs (They are spirits of devils,

And he cried mightily with a loud voice, saying, Babylon the great is fallen, is fallen, and is become an habitation of devils, and an hold of every unclean spirit, and an hold of every unclean beast, and a cage of every unclean and hateful bird.