Nadab and Abihu had died before the Lord when they offered profane fire before the Lord in the Wilderness of Sinai; and they had no children. So Eleazar and Ithamar ministered as priests in the presence of Aaron their father.
Therefore you and your sons with you shall attend to your priesthood for everything at the altar and behind the veil; and you shall serve. I give your priesthood to you as a gift for service, but the outsider who comes near shall be put to death.”
And Moses spoke to Aaron, and to Eleazar and Ithamar, his sons who were left: “Take the grain offering that remains of the offerings made by fire to the Lord, and eat it without leaven beside the altar; for it is most holy.
And you shall gird them with sashes, Aaron and his sons, and put the hats on them. The priesthood shall be theirs for a perpetual statute. So you shall consecrate Aaron and his sons.