1 Samuel 19:5-9

For he did put his life in his hand, and slew the Philistine, and the LORD wrought a great salvation for all Israel: thou sawest it, and didst rejoice: wherefore then wilt thou sin against innocent blood, to slay David without a cause?

And Saul hearkened unto the voice of Jonathan: and Saul sware, As the LORD liveth, he shall not be slain.

And Jonathan called David, and Jonathan shewed him all those things. And Jonathan brought David to Saul, and he was in his presence, as in times past.

And there was war again: and David went out, and fought with the Philistines, and slew them with a great slaughter; and they fled from him.

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