1 Samuel 17:45-50

But David said to him, “You come to me using a sword and two spears. But I come to you in the name of the LORD All-Powerful, the God of the armies of Israel! You have spoken against him. Today the LORD will hand you over to me, and I’ll kill you and cut off your head. Today I’ll feed the bodies of the Philistine soldiers to the birds of the air and the wild animals. Then all the world will know there is a God in Israel! Everyone gathered here will know the LORD does not need swords or spears to save people. The battle belongs to him, and he will hand you over to us.” As Goliath came near to attack him, David ran quickly to meet him. 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. 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.