'Evil Spirit' in the Bible

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

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

and the evil spirit answered and said, "Jesus I know, and Paul I know: but who are ye?"

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