just as the LORD had told Moses. The pans were a warning to the Israelites that only Aaron's descendants would be allowed to offer incense to the LORD. Anyone else who tried would be punished like Korah and his followers.
Even though the Law of Moses says that the priests must be descendants of Levi, those priests cannot make anyone perfect. So there needs to be a priest like Melchizedek, rather than one from the priestly family of Aaron.