1 Samuel 17:17-23

17Now Jesse said to his son David, “Take this ephah That is, probably about 36 pounds or about 16 kilograms of roasted grain and these ten loaves of bread for your brothers and hurry to their camp. 18Take along these ten cheeses to the commander of their unit. See how your brothers are and bring back some assurance Or some token; or some pledge of spoils from them.

19They are with Saul and all the men of Israel in the Valley of Elah, fighting against the Philistines.” 20Early in the morning David left the flock in the care of a shepherd, loaded up and set out, as Jesse had directed. He reached the camp as the army was going out to its battle positions, shouting the war cry. 21Israel and the Philistines were drawing up their lines facing each other. 22David left his things with the keeper of supplies, ran to the battle lines and asked his brothers how they were. 23As he was talking with them, Goliath, the Philistine champion from Gath, stepped out from his lines and shouted his usual defiance, and David heard it.