'Unclean Spirit' in the Bible

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

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

And they were all amazed, so that they questioned among themselves, saying, "What is this? A new teaching! With authority he commands even the unclean spirits, and they obey him."

And whenever the unclean spirits saw him, they fell down before him and cried out, "You are the Son of God."

because they said, "He has an unclean spirit."

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

For he had said to him, "Come out of the man, you unclean spirit!"

So he gave them permission. And the unclean spirits came out, and entered the swine; and the herd, numbering about two thousand, rushed down the steep bank into the sea, and were drowned in the sea.

And he called to him the twelve, and began to send them out two by two, and gave them authority over the unclean spirits.

But a woman whose little daughter was possessed by an unclean spirit heard about him, and she came and fell at his feet.

And when Jesus saw that a crowd came running together, he rebuked the unclean spirit, saying to it, "You dumb and deaf spirit, I command you, come out of him, and never enter him again."