The Number and Duties of the Levites

31 Now these are the generations of Aaron and Moses, in the day when the word of the Lord came to Moses on Mount Sinai. 2 These are the names of the sons of Aaron: Nadab the oldest, and Abihu, Eleazar, and Ithamar. 3 These are the names of the sons of Aaron, the priests, on whom the holy oil was put, who were marked out as priests. 4 And Nadab and Abihu were put to death before the Lord when they made an offering of strange fire before the Lord, in the waste land of Sinai, and they had no children: and Eleazar and Ithamar did the work of priests before Aaron their father. 5 And the Lord said to Moses, 6 Make the tribe of Levi come near, and put them before Aaron the priest, to be his helpers, 7 In order that they may be responsible to him and to all Israel for the care of the Tent of meeting, and to do the work of the House; 8 And they will have the care of all the vessels of the Tent of meeting, and will do for the children of Israel all the necessary work of the House. 9 Give the Levites to Aaron and his sons; so that they may be his without question from among the children of Israel. 10 And give orders that Aaron and his sons are to keep their place as priests; any strange person who comes near is to be put to death. 11 And the Lord said to Moses, 12 See, I have taken the Levites out of the children of Israel to be mine in place of the first sons of the children of Israel; 13 For all the first sons are mine; on the day when I put to death all the first sons in the land of Egypt, I took for myself every first male birth of man and beast. 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.