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.
Matthew Henry's Commentary on 1 Samuel 17:45-47
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.