'Stones' in the Bible

Instead, he took his staff in his hand and chose five smooth stones from the wadi and put them in the pouch, in his shepherd’s bag. Then, with his sling in his hand, he approached the Philistine.

“When someone pursues you and attempts to take your life, my lord’s life will be tucked safely in the place where the Lord your God protects the living. However, He will fling away your enemies’ lives like stones from a sling.