1 Samuel 17:57

53The children of Israel returned from chasing after the Philistines, and they plundered their camp.

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

55When 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.”

56The king said, “Inquire whose son the young man is!”

57As 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.

58Saul said to him, “Whose son are you, you young man?” David answered, “I am the son of your servant Jesse the Bethlehemite.”