Scofield Reference Notes, 1917 Edition1 Samuel 16

And David Cf. 1 Samuel 17:55,56. The order of events is:

(1) David, whose skill on the harp, and valour in the combat with the lion and bear 1 Samuel 17:34,36 were known to "one of the servants" of Saul, was brought to play before the king 1 Samuel 16:17,18.

(2) David returns to Bethlehem 1 Samuel 17:15.

(3) David is sent to Saul's camp 1 Samuel 17:17,18 and performs his great exploit.

(4) Saul's question 1 Samuel 17:55,56 implies only that he had forgotten the name of David's father --not remarkable certainly in an oriental king.