1 Samuel 17:45-50

17:45 Then said David to the Philistine, Thou comest to me with a sword, and with a spear, and with a shield: but I come to thee in the name of the LORD of hosts, the God of the armies of Israel, whom thou hast defied. 17:46 This day will the LORD deliver thee into mine hand; and I will smite thee, and take thine head from thee; and I will give the carcases of the host of the Philistines this day unto the fowls of the air, and to the wild beasts of the earth; that all the earth may know that there is a God in Israel. 17:47 And all this assembly shall know that the LORD saveth not with sword and spear: for the battle [is] the LORD’S, and he will give you into our hands. 17:48 And it came to pass, when the Philistine arose, and came and drew nigh to meet David, that David hasted, and ran toward the army to meet the Philistine. 17:49 And David put his hand in his bag, and took thence a stone, and slang [it], and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth. 17:50 So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but [there was] no sword in the hand of David.