50 And David is stronger than the Philistine with a sling and with a stone, and smiteth the Philistine, and putteth him to death, and there is no sword in the hand of David, 51 and David runneth and standeth over the Philistine, and taketh his sword, and draweth it out of its sheath, and putteth him to death, and cutteth off with it his head; and the Philistines see that their hero 'is' dead, and flee.
Matthew Henry's Commentary on 1 Samuel 17:50-51
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!