When the words were heard which David spoke, they rehearsed them before Saul; and he sent for him.
Regarding those five smooth stones which David put in his shepherd's bag, it is rather amazing that one writer spoke of those stones as the size of a man's fist.  Such an idea could have come only from that remarkable statue of David which stands in front of the Uffizi Gallery in Italy and exhibits a rock the size of a man's fist in David's sling!  That was only the artist's way of emphasizing the stone.  No rock of that size could possibly have "sunk into the forehead of Goliath."