45 And David saith unto the Philistine, 'Thou art coming unto me with sword, and with spear, and with buckler, and I am coming unto thee in the name of Jehovah of Hosts, God of the ranks of Israel, which thou hast reproached. 46 This day doth Jehovah shut thee up into my hand—and I have smitten thee, and turned aside thy head from off thee, and given the carcase of the camp of the Philistines this day to the fowl of the heavens, and to the beast of the earth, and all the earth do know that God is for Israel. 47 and all this assembly do know that not by sword and by spear doth Jehovah save, that the battle 'is' Jehovah's, and He hath given you into our hand.'
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.