1 Samuel 17:21

19Now Saul, and they, and all the men of Israel, were in the valley of Elah, fighting with the Philistines.

20And David rose up early in the morning, and left the sheep with a keeper, and took, and went, as Jesse had commanded him; and he came to the trench, as the host was going forth to the fight, and shouted for the battle.

21For Israel and the Philistines had put the battle in array, army against army.

22And David left his carriage in the hand of the keeper of the carriage, and ran into the army, and came and saluted his brethren.

23And as he talked with them, behold, there came up the champion, the Philistine of Gath, Goliath by name, out of the armies of the Philistines, and spake according to the same words: and David heard them.