1 Samuel 17:15-19

Now David went to and fro from Saul to feed his father’s sheep at Beth-lehem. And the Philistine drew near morning and evening, and presented himself forty days. And Jesse said unto David his son, Take now for thy brethren an ephah of this parched grain, and these ten loaves, and carry them quickly to the camp to thy brethren; and bring these ten cheeses unto the captain of their thousand, and look how thy brethren fare, and take their pledge. Now Saul, and they, and all the men of Israel, were in the vale of Elah, fighting with the Philistines.