'Evil Spirit' in the Bible

So that from his body were brought unto the sick handkerchiefs or aprons, and the diseases departed from them, and the evil spirits went out of them.

Then certain of the vagabond Jews, exorcists, took upon themselves to call over them who had evil spirits the name of the Lord Jesus, saying, We adjure you by Jesus whom Paul preaches.

And the evil spirit answered and said, Jesus I know, and Paul I know; but who are you?

And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded.