1 Samuel 17:40-50

40And he took his staff in his hand, and chose for himself five smooth stones out of the brook, and put them in a shepherd’s bag which he had, even in a bag; and his sling was in his hand: and he drew near to the Philistine.12 41And the Philistine advanced and drew near to David; and the man that bore the shield went before him. 42And when the Philistine looked about, and saw David, he disdained him: for he was a youth, and ruddy, and of a fair countenance. 43And the Philistine said to David, Am I a dog, that thou comest to me with staffs? And the Philistine cursed David by his gods. 44And the Philistine said to David, Come to me, and I will give thy flesh to the fowls of the air, and to the beasts of the field. 45Then 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. 46This day will the LORD deliver thee into my hand; and I will smite thee, and take thy head from thee; and I will give the dead bodies of the host of the Philistines this day to 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.3 47And 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.

48And it came to pass, when the Philistine arose, and came and drew near to meet David, that David hasted, and ran toward the army to meet the Philistine. 49And David put his hand in his bag, and took from there a stone, and slung it with his sling, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth. 50So 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.