1 Samuel 17:54-56

Amplified Bible

⁵⁴ Then David took the head of the Philistine and brought it to Jerusalem, but he put his weapons in his tent.

⁵⁵ When Saul saw David going out against the Philistine, he said to Abner the captain of the army, “Abner, whose son is this young man?” And Abner answered, “By your life, O king, I do not know.” ⁵⁶ The king said, “Ask whose son the young man is.”