Numbers 3:1-10 International Standard Version (ISV)
3 This is a record of the genealogies[a] of Aaron and Moses current as of[b] the day on which the Lord addressed Moses on Mount Sinai. 2 The[c] sons of Aaron were Nadab the first-born, Abihu, Eleazar, and Ithamar 3 who[d] were anointed priests and whom he consecrated[e] as priests. 4 Nadab and Abihu died in the Lord’s presence when they offered unauthorized[f] fire before him[g] in the Sinai wilderness. Since they didn’t have their own children, Eleazar and Ithamar ministered as priests under the authority of[h] Aaron their father.
Appointment of the Descendants of Levi as Priests
5 The Lord told Moses, 6 “Bring the tribe of Levi near and present them to Aaron the priest so they may serve him. 7 They are to take care of his needs and the needs of the whole congregation at the Tent of Meeting by performing duties[i] at the tent. 8 They are to take charge of the utensils at the Tent of Meeting and meet the needs of the Israelis by performing duties on behalf of the tent. 9 Assign[j] the descendants of Levi to Aaron and his sons from among the Israelis. 10 Appoint Aaron and his sons so that they are to take responsibility for their priesthood. Any unauthorized[k] person who approaches it is to be put to death.”