1 Samuel 17:38-51

He gave his own armour to David for him to wear: a bronze helmet, which he put on David's head, and a coat of armour. David strapped Saul's sword over the armour and tried to walk, but he couldn't, because he wasn't used to wearing them. “I can't fight with all this,” he said to Saul. “I'm not used to it.” So he took it all off. He took his shepherd's stick and then picked up five smooth stones from the stream and put them in his bag. With his sling ready, he went out to meet Goliath. The Philistine started walking towards David, with his shield-bearer walking in front of him. He kept coming closer, and when he got a good look at David, he was filled with scorn for him because he was just a nice, good-looking boy. He said to David, “What's that stick for? Do you think I'm a dog?” And he called down curses from his god on David. “Come on,” he challenged David, “and I will give your body to the birds and animals to eat.” David answered, “You are coming against me with sword, spear, and javelin, but I come against you in the name of the LORD Almighty, the God of the Israelite armies, which you have defied. This very day the LORD will put you in my power; I will defeat you and cut off your head. And I will give the bodies of the Philistine soldiers to the birds and animals to eat. Then the whole world will know that Israel has a God, and everyone here will see that the LORD does not need swords or spears to save his people. He is victorious in battle, and he will put all of you in our power.” Goliath started walking towards David again, and David ran quickly towards the Philistine battle line to fight him. He put his hand into his bag and took out a stone, which he slung at Goliath. It hit him on the forehead and broke his skull, and Goliath fell face downwards on the ground. And so, without a sword, David defeated and killed Goliath with a sling and a stone! He ran to him, stood over him, took Goliath's sword out of its sheath, and cut off his head and killed him. When the Philistines saw that their hero was dead, they ran away.