'Unclean Spirit' in the Bible

And there was in their synagogue a man with an unclean spirit; and he cried out,

And when the unclean spirit had torn him, and cried with a loud voice, he came out of him.

And they were all amazed, so that they questioned among themselves, saying, What thing is this? what new doctrine is this? for with authority he commandeth even the unclean spirits, and they obey him.

And unclean spirits, when they saw him, fell down before him, and cried, saying, Thou art the Son of God.

Because they said, He hath an unclean spirit.

And when he had come out of the boat, immediately there met him out of the tombs a man with an unclean spirit,

(For he said to him, Come out of the man, thou unclean spirit.)

And forthwith Jesus gave them leave. And the unclean spirits went out, and entered into the swine: 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 calleth to him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits;

For a certain woman, whose young daughter had an unclean spirit, heard of him, and came and fell at his feet: