David defeats Goliath
David hit Goliath with a rock from his sling. When Goliath fell over, David cut off his head.
Key passages
1 Sa 17:40–51

Then he took his staff in his hand, picked out for himself five smooth stones from the wadi, and he put them in his shepherd’s bag, in the pouch. And with his sling in his hand, he approached the Philistine. Then the Philistine came on, getting nearer and nearer to David, with his shield …

See also
1 Sa 21:9;