Cross reference
1 Samuel 18:2
2 And Saul took him that day, and would let him go no more home to his father's house.
1 Samuel 17:15
15 Now David went to and fro from Saul to feed his father's sheep at Beth-lehem.
1 Samuel 16:21-23
21 And David came to Saul, and stood before him: and he loved him greatly; and he became his armorbearer.
22 And Saul sent to Jesse, saying, Let David, I pray thee, stand before me; for he hath found favor in my sight.
23 And it came to pass, when the `evil' spirit from God was upon Saul, that David took the harp, and played with his hand: so Saul was refreshed, and was well, and the evil spirit departed from him.