1 Samuel 17:52-57
English Standard Version
Chapter 17
52And the men of Israel and Judah rose with a shout and pursued the Philistines as far as Gath and the gates of Ekron, so that the wounded Philistines fell on the way from Shaaraim as far as Gath and Ekron. 53And the people of Israel came back from chasing the Philistines, and they plundered their camp. 54And David took the head of the Philistine and brought it to Jerusalem, but he put his armor in his tent.
55As soon as Saul saw David go out against the Philistine, he said to Abner, the commander of the army, "Abner, whose son is this youth?" And Abner said, "As your soul lives, O king, I do not know."
56And the king said, "Inquire whose son the boy is."
57And as soon as David returned from the striking down of the Philistine, Abner took him, and brought him before Saul with the head of the Philistine in his hand.