The Number and Duties of the Levites

31 Now this is the history of the generations of Aaron and Moses in the day that Yahweh spoke with Moses in Mount Sinai. 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. 5 Yahweh spoke to Moses, saying, 6 “Bring the tribe of Levi near, and set them before Aaron the priest, that they may minister to him. 7 They shall keep his requirements, and the requirements of the whole congregation before the Tent of Meeting, to do the service of the tabernacle. 8 They shall keep all the furnishings of the Tent of Meeting, and the obligations of the children of Israel, to do the service of the tabernacle. 9 You shall give the Levites to Aaron and to his sons. They are wholly given to him on the behalf of the children of Israel. 10 You shall appoint Aaron and his sons, and they shall keep their priesthood. The stranger who comes near shall be put to death.” 11 Yahweh spoke to Moses, saying, 12 “Behold, I have taken the Levites from among the children of Israel instead of all the firstborn who open the womb among the children of Israel; and the Levites shall be mine: 13 for all the firstborn are mine. On the day that I struck down all the firstborn in the land of Egypt I made holy to me all the firstborn in Israel, both man and animal. They shall be mine. I am Yahweh.”

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.