'Unclean Spirits' in the Bible

And they were all amazed, so that [they began] to discuss with one another, saying, "What is this? A new teaching with authority! He even commands the unclean spirits and they obey him."

And the unclean spirits, whenever they saw him, were falling down before him and crying out, saying, "You are the Son of God!"

And he permitted them. And the unclean spirits came out [and] entered into the pigs, and the herd--about two thousand--rushed headlong down the steep slope into the sea and were drowned in the sea.

And he summoned the twelve and began to send them out two [by] two, and gave them authority over the unclean spirits.