David spoke to the men who stood by him, saying, What shall be done to the man who kills this Philistine, and takes away the reproach from Israel? for who is this uncircumcised Philistine, that he should defy the armies of the living God?
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 ).