'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.

And he cried with a great, strong voice, saying, She fell, Babylon the great fell, and became the dwelling of devils, and the prison of every unclean spirit, and the prison of every unclean and detested bird.