1 Samuel 17:45-51

45David said to the Philistine, “You come against me with sword and spear and javelin, but I come against you in the name of the LORD Almighty, the God of the armies of Israel, whom you have defied. 46This day the LORD will deliver you into my hands, and I’ll strike you down and cut off your head. This very day I will give the carcasses of the Philistine army to the birds and the wild animals, and the whole world will know that there is a God in Israel.

47All those gathered here will know that it is not by sword or spear that the LORD saves; for the battle is the LORD ’s, and he will give all of you into our hands.” 48As the Philistine moved closer to attack him, David ran quickly toward the battle line to meet him.

49Reaching into his bag and taking out a stone, he slung it and struck the Philistine on the forehead. The stone sank into his forehead, and he fell facedown on the ground.

50So David triumphed over the Philistine with a sling and a stone; without a sword in his hand he struck down the Philistine and killed him.

51David ran and stood over him. He took hold of the Philistine’s sword and drew it from the sheath. After he killed him, he cut off his head with the sword. When the Philistines saw that their hero was dead, they turned and ran.