'Evil Spirit' in the Bible

insomuch that unto the sick were carried away from his body handkerchiefs or aprons, and the evil spirits went out.

But certain also of the strolling Jews, exorcists, took upon them to name over them that had the evil spirits the name of the Lord Jesus, saying, I adjure you by Jesus whom Paul preacheth.

And the evil spirit answered and said unto them, Jesus I know, and Paul I know, but who are ye?

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