15 Number the children of Levi by their fathers' houses, by their families: every male from a month old and upward shalt thou number them.
All that were numbered of the Levites, whom Moses and Aaron numbered at the commandment of Jehovah, by their families, all the males from a month old and upward, were twenty and two thousand. And Jehovah said unto Moses, Number all the first-born males of the children of Israel from a month old and upward, and take the number of their names.
Everything that openeth the womb, of all flesh which they offer unto Jehovah, both of man and beast shall be thine: nevertheless the first-born of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem. And those that are to be redeemed of them from a month old shalt thou redeem, according to thine estimation, for the money of five shekels, after the shekel of the sanctuary (the same is twenty gerahs).
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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.