There was war again: and David went out, and fought with the Philistines, and killed them with a great slaughter; and they fled before him.
"An evil spirit from the Lord came upon Saul"  (1 Samuel 19:9).  "We are not to conclude that God sent an evil spirit, but that he permitted an evil spirit to take possession of Saul.  The spirit of envy and jealousy is obviously from the devil."[7]