1 Samuel 17:40-47

Then he took his staff in his hand, and chose five smooth stones from the wadi, and put them in his shepherd's bag, in the pouch; his sling was in his hand, and he drew near to the Philistine. The Philistine came on and drew near to David, with his shield-bearer in front of him. When the Philistine looked and saw David, he disdained him, for he was only a youth, ruddy and handsome in appearance. The Philistine said to David, “Am I a dog, that you come to me with sticks?” And the Philistine cursed David by his gods. The Philistine said to David, “Come to me, and I will give your flesh to the birds of the air and to the wild animals of the field.” But David said to the Philistine, “You come to me with sword and spear and javelin; but I come to you in the name of the LORD of hosts, the God of the armies of Israel, whom you have defied. This very day the LORD will deliver you into my hand, and I will strike you down and cut off your head; and I will give the dead bodies of the Philistine army this very day to the birds of the air and to the wild animals of the earth, so that all the earth may know that there is a God in Israel, and that all this assembly may know that the LORD does not save by sword and spear; for the battle is the LORD's and he will give you into our hand.”