1 Samuel 17:48-51

48When the Philistine moved closer in order to attack, David quickly ran toward the opposing battle line to attack the Philistine.

49Then David reached into his bag, took out a stone, hurled it from his sling, and struck the Philistine in the forehead. The stone sank into Goliath’s forehead, and he fell to the ground on his face.

50So using ⌞only⌟ a sling and a stone, David proved to be stronger than the Philistine. David struck down and killed the Philistine, even though David didn’t have a sword in his hand.

51David ran and stood over the Philistine. He took Goliath’s sword, pulled it out of its sheath, and made certain the Philistine was dead by cutting off his head. When the Philistines saw their hero had been killed, they fled.