55 When Saul saw David go out to meet the Philistine, he said to Abner, commander of the army, "Tell me about this young man's family." Abner said, "For the life of me, O King, I don't know." 56 The king said, "Well, find out the lineage of this raw youth." 57 As soon as David came back from killing the Philistine, Abner brought him, the Philistine's head still in his hand, straight to Saul. 58 Saul asked him, "Young man, whose son are you?" "I'm the son of your servant Jesse," said David, "the one who lives in Bethlehem."
Matthew Henry's Commentary on 1 Samuel 17:55-58
Commentary on 1 Samuel 17:48-58
(Read 1 Samuel 17:48-58)
See how frail and uncertain life is, even when a man thinks himself best fortified; how quickly, how easily, and by how small a matter, the passage may be opened for life to go out, and death to enter! Let not the strong man glory in his strength, nor the armed man in his armour. God resists the proud, and pours contempt on those who defy him and his people. No one ever hardened his heart against God and prospered. The history is recorded, that all may exert themselves for the honour of God, and the support of his cause, with bold and unshaken reliance on him. There is one conflict in which all the followers of the Lamb are, and must be engaged; one enemy, more formidable than Goliath, still challenges the armies of Israel. But "resist the devil, and he will flee from you." Go forth to battle with the faith of David, and the powers of darkness shall not stand against you. But how often is the Christian foiled through an evil heart of unbelief!