1 Samuel 17:12-22

Now David was the son of the Ephrathite of Bethlehem in Judah, named Jesse, who had eight sons. Jesse was old in the days of Saul, advanced in years among men. His three older sons had followed Saul into battle. The names of his three sons who went to battle were Eliab, the firstborn; next, Abinadab; and third, Shammah. David was the youngest. Now the three oldest followed Saul, but David went back and forth from Saul to tend his father’s flock at Bethlehem. The Philistine [Goliath] came out morning and evening, and took his stand for forty days. Then Jesse said to David his son, “Take for your brothers an ephah of this roasted grain and these ten loaves of bread and run quickly to the camp to your brothers. Also take these ten cuts of cheese to the commander of the unit. See how your brothers are doing and bring back news of them. Now they are with Saul and all the men of Israel in the Valley of Elah, fighting with the Philistines.” So David got up early in the morning, left the flock with a keeper, picked up the provisions and went just as Jesse had directed him. And he came to the encampment as the army was going out in battle formation shouting the battle cry. Israel and the Philistines drew up in battle formation, army against army. Then David left his provisions in the care of the supply keeper, and ran to the ranks and came and greeted his brothers.