'Unclean Spirits' in the Bible

They all were amazed, so as to question among themselves, saying, What is this? What new doctrine is this? For He even commands the unclean spirits with authority, and they obey Him.

And unclean spirits, when they saw Him, they fell down before Him and cried, saying, You are the Son of God!

And when He had come out of the boat, immediately a man with unclean spirits met Him out of the tombs,

And immediately Jesus allowed them. And the unclean spirits went out and entered into the pigs. And the herd ran violently down a steep place into the sea (they were about two thousand), and were choked in the sea.

And He called the Twelve and began to send them out by two and two. And He gave them authority over unclean spirits,