"Also, join to yourself your brother Aaron, with his sons from the midst of the sons of Israel, so that they may exercise the priesthood for me: Aaron, Nadab and Abihu, Eleazar and Ithamar.
The sons of Amram: Aaron and Moses. Now Aaron was separated so that he might minister in the Holy of Holies, he and his sons forever, and so that he might burn incense to the Lord, according to his rite, and so that he might bless his name in perpetuity.
leaving behind their suburbs and possessions, and crossing over to Judah and to Jerusalem. For Jeroboam and his followers had cast them out, so that they could not exercise the priestly office to the Lord.
And with all these you shall vest your brother Aaron, and his sons with him. And you shall consecrate all their hands, and you shall sanctify them, so that they may exercise the priesthood for me.
Aaron, certainly, as well as his sons. And you shall impose headdresses upon them. And they shall be priests to me by a perpetual ordinance. After you have initiated their hands,
the vestments, which are to be used in the ministry of the Sanctuary, the vestments of Aaron, the high priest, as well as those of his sons, in order to exercise the priesthood to me."
And the sons of Aaron, Nadab and Abihu, picking up their censers, placed fire in them and incense upon them, offering in the sight of the Lord a strange fire, such as was not instructed of them.
And Moses spoke to Aaron, and to his sons, Eleazar and Ithamar, who were remaining: "Take the sacrifice which remains from the oblation of the Lord, and eat it without leaven next to the altar, because it is the Holy of holies.
This is the anointing of Aaron and his sons, by the ceremonies of the Lord, in the day when Moses offered them, so that they may fulfill the priesthood,
But as for you and your sons: guard the priesthood. For all that pertains to the service of the altar and of what is beyond the veil shall be exercised by the priests. If any outsider will approach, he shall be killed."
Then the sons of Israel moved their camp, from Beeroth among the sons of Jaakan, into Moserah, where Aaron died and was buried, and where his son Eleazar was installed in the priesthood in his place.
For the Lord your God himself has chosen him out of all your tribes, so that he may stand and minister to the name of the Lord, him and his sons, forever.
And I chose him out of all the tribes of Israel for myself as priest, so that he might ascend to my altar, and burn incense to me, and wear the ephod before me. And I gave to the house of your father all the sacrifices of the sons of Israel.