 Similarly, the Pirke De-Rabbi Eliezer taught that Saul saw the Philistines turning against Israel, and he knew that Israel had sinned in the matter of the ban.Saul looked at the 12 stones, and for each tribe that had followed the law, its stone (on the High Priest's breastplate) shined with its light, and for each tribe that had transgressed, the light of its stone was dim.So Saul knew that the Tribe of Benjamin had trespassed in the matter of the ban.