'Unclean Spirits' in the Bible

And they were all greatly surprised, so that they put questions to one another, saying, What is this? a new teaching! with authority he gives orders even to the unclean spirits, and they do what he says.

And the unclean spirits, whenever they saw him, went down before him, crying out, and saying, You are the Son of God.

And he let them do it. And the unclean spirits came out and went into the pigs; and the herd went rushing down a sharp slope into the sea, about two thousand of them; and they came to their death in the sea.

And he gave orders to the twelve, and sent them out two by two; and he gave them authority over the unclean spirits;