Afterward you will go to Gibeah of God, where there are Philistine officials. ¹  When you enter the town, you will meet a company of prophets coming down from the high place. They will have harps, tambourines, flutes, and lyres, and they will be prophesying.

Let our lord instruct his servants who are here before you to look for a man who knows how to play the lyre. Then whenever the evil spirit from God comes upon you, he can play the lyre ¹  and you will feel better.” ² 

So whenever the spirit from God would come upon Saul, David would take his lyre and play it. This would bring relief to Saul and make him feel better. Then the evil spirit would leave him alone. ¹