Then said David to the Philistine, You come to me with a sword, and with a spear, and with a javelin: but I come to you in the name of Yahweh of hosts, the God of the armies of Israel, whom you have defied.
Now when Saul saw David go out against this fellow, he said to his captain Abner, Who is this young fellow? [Who is his dad?] And Abner said, [I don't know,] as thy soul live I can't tell you. And so the king says, Inquire and find out whose son he is. And so as David returned from the slaughter of the Philistine, Abner took him, and brought him before Saul with the head of the Philistine still in his hand ( 1 Samuel 17:55-57 ).