So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine, and killed him; but there was no sword in the hand of David.
Some scholars profess to find a difficulty with the statement in this narrative that David killed Goliath with a sling and with a stone  (1 Samuel 17:50), and in the very next verse, the text states that David took the giant's sword and, "killed the giant and cut off his head."