"JEHOVAH WILL SURRENDER YOU INTO MY HAND"

 At first, Saul tried to outfit David with his own armor. It was much like Goliath's, made of copper, and it likely included a large hauberk or shirt of mail, composed of overlapping scales. However, David tried moving about while wearing that large and cumbersome equipment and soon found that it would not work for him.  He was not trained as a soldier, so he was not used to wearing armor, especially the armor that was worn by Saul, who was the tallest man in the nation of Israel! (1 Samuel 9:2) He removed it all and chose the garb he was used to wearing-that of a shepherd equipped to protect his flock. - 1 SAMUEL 17:38-40. 

David carried his shepherd's staff, a bag over his shoulder, and a sling. Now a sling might not seem like much, but it was in fact a formidable weapon. Consisting of a small pouch at the end of two long leather straps, it was an ideal weapon for a shepherd. He would place a stone in the pouch, whirl it over his head at great speed, and then release one of the straps, hurling the stone with lethal accuracy. So effective was this weapon that armies sometimes used divisions of slingers. 

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