'Unclean Spirits' in the Bible

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

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

And he gave them permission. The unclean spirits came out and entered into the pigs. The herd of about two thousand rushed down the steep bank into the sea, and they were drowned in the sea.

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