1 Samuel 17:48-50

New Revised Standard Version Catholic Edition

⁴⁸ When the Philistine drew nearer to meet David, David ran quickly toward the battle line to meet the Philistine. ⁴⁹ David put his hand in his bag, took out a stone, slung it, and struck the Philistine on his forehead; the stone sank into his forehead, and he fell face down on the ground.

⁵⁰ So David prevailed over the Philistine with a sling and a stone, striking down the Philistine and killing him; there was no sword in David’s hand.