Pseudo-Chrysostom — as excerpted in the Catena Aurea on Mark 1:23-28

“(Vict. Ant. e Cat. in Marc.) The word Spirit is applied to an Angel, the air, the soul, and even the Holy Ghost. Lest therefore by the sameness of the name we should fall into error, he adds, unclean. And he is called unclean on account of his impiousness and far removal from God, and because he employs himself in all unclean and wicked works.”