And you shall gird them with girdles, Aaron and his sons, and put the bonnets 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 to Aaron, and to Eleazar and to Ithamar, his sons that were left, Take the meat 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 of the altar, and within the veil; and you shall serve: I have given your priest's office to you as a service of gift: and the stranger that comes near shall be put to death.
And Nadab and Abihu died before the LORD, when they offered strange 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.