'Unclean Spirits' in the Bible

and they were all amazed, so as to reason among themselves, saying, 'What is this? what new teaching is this? that with authority also the unclean spirits he commandeth, and they obey him!'

and the unclean spirits, when they were seeing him, were falling down before him, and were crying, saying -- 'Thou art the Son of God;'

and immediately Jesus gave them leave, and having come forth, the unclean spirits did enter into the swine, and the herd did rush down the steep place to the sea -- and they were about two thousand -- and they were choked in the sea.

and he doth call near the twelve, and he began to send them forth two by two, and he was giving them power over the unclean spirits,