You shall set the two stones on the shoulder pieces of the ephod, as stones of remembrance for the sons of Israel, and Aaron shall bear their names before the Lord on his two shoulders for remembrance.
a reminder to the Israelites that no outsider, who is not of the descendants of Aaron, shall approach to offer incense before the Lord, so as not to become like Korah and his congregation, just as the Lord had said to him through Moses.