'Unclean' in the Bible
Just then there was a man in their synagogue with an unclean spirit, and he cried out,
After throwing him into convulsions, the unclean spirit cried out with a loud voice and came out of him.
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."
Just as Jesus was getting out of the boat, a man with an unclean spirit came from the tombs and met him.
(For Jesus had said to him, "Come out of that man, you unclean spirit!")
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.
And they saw that some of Jesus' disciples ate their bread with unclean hands, that is, unwashed.
Instead, a woman whose young daughter had an unclean spirit immediately heard about him and came and fell at his feet.
Now when Jesus saw that a crowd was quickly gathering, he rebuked the unclean spirit, saying to it, "Mute and deaf spirit, I command you, come out of him and never enter him again."