You know the story of David and Goliath, the giant? David is a small shepherd who tends his father’s sheep but offers to go up against a Philistine man who is over nine feet tall and was a big bully! David hears the Israelite people talking among themselves about how big this guy is and how they are scared of these people. David explains to King Saul that he has gone up against lions and bears who have attacked his sheep and that God has delivered him from these animals safely and that he trusts God to deliver him from the giant in victory.
Saul agrees to let him go but he must wear a coat of armor and a helmet and a sword. But David wasn’t used to all of this garb and told Saul he couldn’t go out and fight the giant with all this stuff because he wasn’t used to it. So he took 5 stones and a sling shot and went out to face the Philistine. After much mocking from the Philistine giant, David told him that the Lord Almighty, the God of Israel, was on David’s side and the Lord will hand him over to David.