'Unclean Spirits' in the Bible

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."

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.