He took his staff in his hand, and chose him five smooth stones out of the brook, and put them in the shepherd's bag which he had, even in his wallet; and his sling was in his hand: and he drew near to the Philistine.
In the use of the sling it requires much practice to hit the mark; but when once this dexterity is acquired, the sling is nearly as fatal as the musket or bow; see on 1 Samuel 17:49. David was evidently an expert marksman; and his sling gave him greatly the advantage over Goliath; an advantage of which the giant does not seem to have been aware. He could hit him within any speaking distance, if he missed once, he had as many chances as he had stones; and after all, being unencumbered with armour, young, and athletic, he could have saved his life by flight. Against him the Philistine could do but little, except in close fight; it is true he appears to have had a javelin or missile spear, (see on 1 Samuel 17:6), but David took care to prevent the use of all such weapons, by giving him the first blow.