1 Samuel 17:56 in the King James Version
And the king said, Enquire thou whose son the stripling is.
Context
55 When Saul saw David go out against the Philistine, he said to Abner, the captain of the army, “Abner, whose son is this youth?” Abner said, “As your soul lives, O king, I can’t tell.”
56 The king said, “Inquire whose son the young man is!”
57 As David returned from the slaughter of the Philistine, Abner took him and brought him before Saul with the head of the Philistine in his hand.