1 Samuel 17:48-51

That roused the Philistine, and he started toward David. David took off from the front line, running toward the Philistine. David reached into his pocket for a stone, slung it, and hit the Philistine hard in the forehead, embedding the stone deeply. The Philistine crashed, facedown in the dirt. That’s how David beat the Philistine—with a sling and a stone. He hit him and killed him. No sword for David! Then David ran up to the Philistine and stood over him, pulled the giant’s sword from its sheath, and finished the job by cutting off his head. When the Philistines saw that their great champion was dead, they scattered, running for their lives.