40 And Jehovah saith unto Moses, `Number every first-born male of the sons of Israel from a son of a month and upward, and take up the number of their names;
and Moses standeth in the gate of the camp, and saith, `Who `is' for Jehovah? -- unto me!' and all the sons of Levi are gathered unto him; and he saith to them, `Thus said Jehovah, God of Israel, Put each his sword by his thigh, pass over and turn back from gate to gate through the camp, and slay each his brother, and each his friend, and each his relation.' And the sons of Levi do according to the word of Moses, and there fall of the people on that day about three thousand men, and Moses saith, `Consecrate your hand to-day to Jehovah, for a man `is' against his son, and against his brother, so as to bring on you to-day a blessing.'
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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.