1 Samuel 17:49 WEB

⁴⁷  and that all this assembly may know that Yahweh doesn't save with sword and spear: for the battle is Yahweh's, and he will give you into our hand.

⁴⁸  It happened, when the Philistine arose, and came and drew near to meet David, that David hurried, and ran toward the army to meet the Philistine.

⁴⁹  David put his hand in his bag, and took there a stone, and slang it, and struck the Philistine in his forehead; and the stone sank into his forehead, and he fell on his face to the earth.

⁵⁰  So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine, and killed him; but there was no sword in the hand of David.

⁵¹  Then David ran, and stood over the Philistine, and took his sword, and drew it out of the sheath of it, and killed him, and cut off his head therewith. When the Philistines saw that their champion was dead, they fled.