
David and Goliath 1SA 17:49
For forty days the Philistine champion comes out morning and evening and no one in Saul's army will face him. David, sent with bread for his brothers, hears the taunt and asks the question nobody else is asking. Saul offers his own armour; the boy cannot walk in it and takes it off. Five smooth stones from the brook, one sling, and the giant falls on his face. David had argued his case from a lion and a bear he had killed alone.
The passage
1SA 17:49 · Read the passage47And all this assembly shall know that the LORD saveth not with sword and spear: for the battle {is} the LORD'S, and he will give you into our hands.
48And it came to pass, when the Philistine arose, and came and drew nigh to meet David, that David hasted, and ran toward the army to meet the Philistine.
49And David put his hand in his bag, and took thence a stone, and slang {it}, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth.
50So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but {there was} no sword in the hand of David.
51Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith. And when the Philistines saw their champion was dead, they fled.
52And the men of Israel and of Judah arose, and shouted, and pursued the Philistines, until thou come to the valley, and to the gates of Ekron. And the wounded of the Philistines fell down by the way to Shaaraim, even unto Gath, and unto Ekron.
53And the children of Israel returned from chasing after the Philistines, and they spoiled their tents.

