'Unclean Spirits' in the Bible

And they were all amazed, insomuch that they questioned among themselves, saying, What is this? A new teaching! With authority He commandeth even the unclean spirits, and they obey Him!"

And the unclean spirits, whensoever they were beholding Him, were falling down before Him, and crying, saying, "Thou art the Son of God."

And He permitted them. And, coming out, the unclean spirits entered into the swine; and the herd rushed down the steep into the sea, about two thousand, and were drowned in the sea.

And He calleth to Him the twelve, and began to send them forth by two and two, and was giving them authority over the unclean spirits;