'Unclean Spirit' in the Bible

And in their synagogue was a man with an unclean spirit. And he cried out,

And the unclean spirit, convulsing him, and crying with a loud voice, he came out of him.

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!

Because they said, He has an unclean spirit.

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

For He said to him, Come out of the man, unclean spirit!

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,

For a woman, whose young daughter had an unclean spirit, heard of Him and came and fell at His feet.

And seeing that a crowd is running together, Jesus rebuked the unclean spirit, saying to him, Dumb and deaf spirit, I command you, come out of him and enter no more into him!