And you shall gird them with belts, Aaron and his sons, and put the turbans on them: and the priest's office shall be theirs for a perpetual statute: and you shall consecrate Aaron and his sons.
And Moses spoke unto Aaron, and unto Eleazar and unto Ithamar, his sons that were left, Take the grain offering that remains of the offerings of the LORD made by fire, and eat it without leaven beside the altar: for it is most holy:
Therefore you and your sons with you shall keep your priest's office for everything at the altar, and within the veil; and you shall serve: I have given your priest's office unto you as a gift for service: and the stranger that comes near shall be put to death.
And Nadab and Abihu died before the LORD, when they offered unholy fire before the LORD, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.