1 Samuel 16:19-23

19Then Saul sent messengers to Jesse and said, Send me David thy son, who is with the sheep. 20And Jesse took an ass with bread, and a flask of wine, and a kid, and sent [them] by David his son to Saul. 21And David came to Saul, and stood before him; and he loved him greatly; and he became his armour-bearer. 22And Saul sent to Jesse, saying, Let David, I pray thee, stand before me; for he has found favour in my sight. 23And it came to pass, when the [evil] spirit from 1God was upon Saul, that David took the harp, and played with his hand; and Saul was refreshed, and was well, and the evil spirit departed from him.