¹ David prevailed over the Philistine with just the sling and the stone. He struck down the Philistine and killed him. David did not even have a sword in his hand. ² 

Saul said to him, “Why have you conspired against me, you and this son of Jesse? You gave ¹  him bread and a sword and inquired of God on his behalf, so that he opposes ²  me and waits in ambush, as is the case today!”