'Unclean Spirits' in the Bible

They were all amazed so that they asked each other, "What is this? A new teaching with authority! He even commands 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."

Jesus gave them permission. So the unclean spirits came out and went into the pigs. Then the herd rushed down the steep slope into the lake, and about two thousand were drowned in the lake.

Jesus called the twelve and began to send them out two by two. He gave them authority over the unclean spirits.