David said to Saul, "Let no one lose heart on account of this Philistine; your servant will go and fight him."
David left his job as a shepherd to do an errand for his dad. He took food to his brothers in the army and checked on the battle with the Philistines. When he heard Goliath spouting challenges to the Israelites, he wanted to know what would be the reward for standing up to the giant everyone was afraid of.
King Saul, who had heard about David, sent for him and tried to talk some sense into him. David was told he was too young and inexperienced to fight the giant. However, David set the king straight by telling him details of his own battles. He’d killed both a lion and a bear, so a mere giant should be no problem.
Saul couldn’t send out a boy against a giant without at least some protection, so he put his own armor on him. But David refused to wear the king’s armor because he wasn’t used to wearing man-made protection. He was used to having God as his protection. The only reason David succeeded in battle with the lion and bear was because God was with him.
When David went out to kill Goliath, the giant cursed him. So David let him know by whose power he’d be killed. Verse 46 details what David said. “This day the LORD will hand you over to me, and I'll strike you down and cut off your head. Today I will give the carcasses of the Philistine army to the birds of the air and the beasts of the earth, and the whole world will know that there is a God in Israel.”
I think Goliath was shocked because the Israelites had been cowering at his defiance. Every eye must have been on David as he ran to the battle line with his sling in his hand. David’s courage became an epidemic among the Israelites. They joined in as soon as they saw that God had given them the battle.
The trouble with giants is that they don’t believe you when you tell them God determines the outcome. Giants tell us that we should run, but they mean run away. When God tells us we should run, He means toward the victory.
Goliath caused trouble, but because David was used to calling to God and listening for God’s guidance, David won the battle.
When you and I hear God’s instruction and we obey despite the obvious challenges, our courage and obedience affects others. When you obey God, you just might start something good that will spread to many others.