1 Samuel 17:33-40

“You don't have a chance against him,” Saul replied. “You're only a boy, and he's been a soldier all his life.” But David told him: Your Majesty, I take care of my father's sheep. And when one of them is dragged off by a lion or a bear, I go after it and beat the wild animal until it lets the sheep go. If the wild animal turns and attacks me, I grab it by the throat and kill it. Sir, I have killed lions and bears that way, and I can kill this worthless Philistine. He shouldn't have made fun of the army of the living God! The LORD has rescued me from the claws of lions and bears, and he will keep me safe from the hands of this Philistine. “All right,” Saul answered, “go ahead and fight him. And I hope the LORD will help you.” Saul had his own military clothes and armor put on David, and he gave David a bronze helmet to wear. David strapped on a sword and tried to walk around, but he was not used to wearing those things. “I can't move with all this stuff on,” David said. “I'm just not used to it.” David took off the armor and picked up his shepherd's stick. He went out to a stream and picked up five smooth rocks and put them in his leather bag. Then with his sling in his hand, he went straight toward Goliath.