The Bible
1 Samuel 17
Israel and the Philistines engage in war—Goliath of Gath, a giant, defies Israel and challenges any Israelite to personal combat—David goes against him in the name of the Lord—David slays Goliath with a sling and a stone—Israel defeats the Philistines.
6And he had greaves of brass upon his legs, and a target of brass between his shoulders.
14And David was the youngest: and the three eldest followed Saul.
15But David went and returned from Saul to feed his father’s sheep at Beth-lehem.
16And the Philistine drew near morning and evening, and presented himself forty days.
21For Israel and the Philistines had put the battle in array, army against army.
24And all the men of Israel, when they saw the man, fled from him, and were sore afraid.
29And David said, What have I now done? Is there not a cause?

56And the king said, Inquire thou whose son the stripling is.