40 And the Lord said to Moses, Let all the first male children be numbered, and take the number of their names.
Then Moses took his place at the way into the tents, and said, Whoever is on the Lord's side, let him come to me. And all the sons of Levi came together to him. And he said to them, This is the word of the Lord, the God of Israel: Let every man take his sword at his side, and go from one end of the tents to the other, putting to death his brother and his friend and his neighbour. And the sons of Levi did as Moses said; and about three thousand of the people were put to death that day. And Moses said, You have made yourselves priests to the Lord this day; for every one of you has made the offering of his son and his brother; the blessing of the Lord is on you this day.
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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.