2 These are the names of the sons of Aaron: Nadab the firstborn, and Abihu, Eleazar, and Ithamar.
3 These are the names of the sons of Aaron, the priests who were anointed, whom he consecrated to minister in the priest's office.
4 Nadab and Abihu died before Yahweh, when they offered strange fire before Yahweh, in the wilderness of Sinai, and they had no children. Eleazar and Ithamar ministered in the priest's office in the presence of Aaron their father.
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Commentary on Numbers 3 Matthew Henry Commentary
Chapter 3
This chapter and the next are concerning the tribe of Levi, which was to be mustered and marshalled by itself, and not in common with the other tribes, intimating the particular honour put upon them and the particular duty and service required from them. The Levites are in this chapter considered,
Num 3:1-13
Here,
Num 3:14-39
The Levites being granted to Aaron to minister to him, they are here delivered to him by tale, that he might know what he had, and employ them accordingly. Observe,
Num 3:40-51
Here is the exchange made of the Levites for the first-born.