1 Samuel 17:55-58

55When 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.”

56The king said, “Ask whose son the young man is.”

57When David returned from killing [Goliath] the Philistine, Abner took him and brought him before Saul with the head of the Philistine in his hand.

58Saul asked him, “Whose son are you, young man?” And David answered, “I am the son of your servant Jesse of Bethlehem.”