1 Samuel 17:53-55

New Revised Standard Version, Anglicised

⁵³ The Israelites came back from chasing the Philistines, and they plundered their camp. ⁵⁴ David took the head of the Philistine and brought it to Jerusalem; but he put his armour in his tent.

⁵⁵ When Saul saw David go out against the Philistine, he said to Abner, the commander of the army, ‘Abner, whose son is this young man?’ Abner said, ‘As your soul lives, O king, I do not know.’