I Samuel 16:1, 7, 11-12, and 22-23

"Now the Lord said to Samuel, 'How long will you mourn for Saul, seeing I have rejected him from reigning over Israel? Fill your horn with oil, and go; I am sending you to Jesse the Bethlehemite. For I have provided Myself a king among his sons.'"

"But the Lord said to Samuel, 'Do not look at his appearance or at his physical stature, because I have refused him. For the Lord does not see as man sees; for man looks at the outward appearance, but the Lord looks at the heart.'"

"And Samuel said to Jesse, 'Are all the young men here?' Then he said, 'There remains yet the youngest, and there he is, keeping the sheep.' And Samuel said to Jesse, 'Send and bring him. For we will not sit down till he comes here.'"

"So he sent and brought him in. Now he was ruddy, with bright eyes, and good-looking. And the Lord said, 'Arise, anoint him; for this is the one!'"

"Then Saul sent to Jesse, saying, 'Please let David stand before me, for he has found favor in my sight.'"

"And so it was, whenever the spirit from God was upon Saul, that David would take a harp and play it with his hand. Then Saul would become refreshed and well, and the distressing spirit would depart from him."