1 Samuel 16:21-23
21 When David came to Saul(A) and entered his service, Saul admired him greatly, and David became his armor-bearer.
22 Then Saul sent word to Jesse: “Let David remain in my service, for I am pleased with him.”
23 Whenever the spirit from God troubled Saul,(B) David would pick up his lyre and play, and Saul would then be relieved, feel better, and the evil spirit would leave him.