KJV
[To be] a memorial unto the children of
Israel, that no stranger, which [is] not of the seed of Aaron, come near to
offer incense before the LORD; that he be not as Korah, and as his company:
as the LORD said to him by the hand of Moses.
BSB
just as the LORD commanded him through Moses. This was to be a reminder to the Israelites that no outsider who is not a descendant of Aaron should approach to offer incense before the LORD, lest he become like Korah and his followers.