31 This is the family line of Aaron and Moses as it was recorded when the Lord spoke to Moses on Mount Sinai: 2 The names of Aaron's sons were Nadab (the oldest), Abihu, Eleazar, and Ithamar. 3 These sons of Aaron were anointed and ordained to minister as priests. 4 But Nadab and Abihu died in the Lord 's presence in the wilderness of Sinai when they burned before the Lord the wrong kind of fire, different than he had commanded. Since they had no sons, this left only Eleazar and Ithamar to serve as priests with their father, Aaron. 5 Then the Lord said to Moses, 6 "Call forward the tribe of Levi, and present them to Aaron the priest to serve as his assistants. 7 They will serve Aaron and the whole community, performing their sacred duties in and around the Tabernacle. 8 They will also maintain all the furnishings of the sacred tent, serving in the Tabernacle on behalf of all the Israelites. 9 Assign the Levites to Aaron and his sons. They have been given from among all the people of Israel to serve as their assistants. 10 Appoint Aaron and his sons to carry out the duties of the priesthood. But any unauthorized person who goes too near the sanctuary must be put to death." 11 And the Lord said to Moses, 12 "Look, I have chosen the Levites from among the Israelites to serve as substitutes for all the firstborn sons of the people of Israel. The Levites belong to me, 13 for all the firstborn males are mine. On the day I struck down all the firstborn sons of the Egyptians, I set apart for myself all the firstborn in Israel, both of people and of animals. They are mine; I am the Lord ."
Matthew Henry's Commentary on Numbers 3:1-13
Commentary on Numbers 3:1-13
(Read Numbers 3:1-13)
There was much work belonging to the priests' office, and there were now only Aaron and his two sons to do it; God appoints the Levites to attend them. Those whom God finds work for, he will find help for. The Levites were taken instead of the first-born. When He that made us, saves us, as the first-born of Israel were saved, we are laid under further obligations to serve him faithfully. God's right to us by redemption, confirms the right he has to us by creation.