'Outsider' in the Bible

It was a memorial for the Israelites, that no outsider who is not a descendant of Aaron should approach to burn incense before the Lord, that he might not become like Korah and his company -- just as the Lord had spoken by the authority of Moses.

They shall be joined with you and attend to the obligations of the tent of meeting, for all the service of the tent; but an outsider may not come near you.

But you and your sons with you shall attend to your priesthood for everything concerning the altar and inside the veil, and you are to perform service. I am giving you the priesthood as a bestowed service, but the outsider who comes near shall be put to death.”