1 Samuel 17:40-41

And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd's bag which he had, even in a scrip; and his sling {was} in his hand: and he drew near to the Philistine. {brook: or, valley} {bag: Heb. vessel} And the Philistine came on and drew near unto David; and the man that bare the shield {went} before him.