'Evil Spirit' in the Bible

But the spirit of the LORD departed from Saul; and an evil spirit, sent of the LORD, vexed him.

Then said his servants unto him, "Behold, an evil spirit sent of God vexeth thee.

Let our lord therefore command his servants to seek a man that is a cunning player with a harp. And then when the evil spirit sent of God cometh upon thee, that he may play with his hand and thou shalt be eased."

And when the spirit of God came upon Saul, David took a harp and played with his hand, and so Saul was refreshed, and did amend; and the evil spirit departed from him.

And it happened on the morrow, that the evil spirit sent of God came upon Saul, so that he prophesied in the midst of the house. And David played on the instrument with his hand as he was daily wont.

And the evil spirit of the LORD was upon Saul as he sat in his house having a javelin in his hand, and David played with his hand.