1 Samuel 17:48-50

New Century Version

⁴⁸ As Goliath came near to attack him, David ran quickly to meet him. ⁴⁹ He took a stone from his bag, put it into his sling, and slung it. The stone hit the Philistine and went deep into his forehead, and Goliath fell facedown on the ground.

⁵⁰ So David defeated the Philistine with only a sling and a stone. He hit him and killed him. He did not even have a sword in his hand.