40 Then he took his stick in his hand, and got five smooth stones from the bed of the stream and put them in a bag such as is used by sheep-keepers; and in his hand was a leather band used for sending stones: and so he went in the direction of the Philistine. 41 And the Philistine came nearer to David; and the man who had his body-cover went before him. 42 And when the Philistine, taking note, saw David, he had a poor opinion of him: for he was only a boy, red-haired and good-looking. 43 And the Philistine said to David, Am I a dog, that you come out to me with sticks? And the Philistine put curses on David by all his gods. 44 And the Philistine said to David, Come here to me, and I will give your flesh to the birds of the air and the beasts of the field. 45 Then David said to the Philistine, You come to me with a sword and a spear and a javelin: but I come to you in the name of the Lord of armies, the God of the armies of Israel on which you have put shame. 46 This day the Lord will give you up into my hands, and I will overcome you, and take your head off you; and I will give the bodies of the Philistine army to the birds of the air and the beasts of the earth today, so that all the earth may see that Israel has a God; 47 And all these people who are here today may see that the Lord does not give salvation by sword and spear: for the fight is the Lord's, and he will give you up into our hands.
48 Now when the Philistine made a move and came near to David, David quickly went at a run in the direction of the army, meeting the Philistine face to face. 49 And David put his hand in his bag and took out a stone and sent it from his leather band straight at the Philistine, and the stone went deep into his brow, and he went down to the earth, falling on his face. 50 So David overcame the Philistine with his leather band and a stone, wounding the Philistine and causing his death: but David had no sword in his hand. 51 So running up to the Philistine and putting his foot on him, David took his sword out of its cover, and put him to death, cutting off his head with it. And when the Philistines saw that their fighter was dead, they went in flight.
Matthew Henry's Commentary on 1 Samuel 17:40-51
Commentary on 1 Samuel 17:40-47
(Read 1 Samuel 17:40-47)
The security and presumption of fools destroy them. Nothing can excel the humility, faith, and piety which appear in David's words. He expressed his assured expectation of success; he gloried in his mean appearance and arms, that the victory might be ascribed to the Lord alone.
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!