The Levitical priests will never fail to have a descendant in my presence to sacrifice burnt offerings, to burn grain offerings, and to prepare daily sacrifices.”
They could have served in my holy place. They could have guarded the gates of the temple. They could have served in the temple by slaughtering the animals for the burnt offerings and the sacrifices for the people. They could have stood in front of the people and served them.
Nadab and Abihu died in the Lord’s presence because they offered unauthorized fire in his presence in the Desert of Sinai. They had no children. So only Eleazar and Ithamar served as priests during the lifetime of their father Aaron.