King James Version
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.New International Version
as the LORD directed him through Moses. This was to remind the Israelites that no one except a descendant of Aaron should come to burn incense before the LORD, or he would become like Korah and his followers.Catholic Public Domain Version
so that the sons of Israel would have, thereafter, something to admonish them, lest any stranger, or anyone who is not of the offspring of Aaron, might approach to offer incense to the Lord, and lest he endure what happened to Korah, and to all his congregation, when the Lord spoke to Moses