The men of Israel said, Have you seen this man who is come up? surely to defy Israel is he come up: and it shall be, that the man who kills him, the king will enrich him with great riches, and will give him his daughter, and make his father's house free in Israel.
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 ).