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.
And in the middle of the night the Lord sent death on every first male child in the land of Egypt, from the child of Pharaoh on his seat of power to the child of the prisoner in the prison; and the first births of all the cattle. Then Pharaoh got up in the night, he and all his servants and all the Egyptians; and a great cry went up from Egypt; for there was not a house where someone was not dead.
For they have been given to me from among the children of Israel; in place of every mother's first son, the first to come to birth in Israel, I have taken them for myself. For every mother's first son among the children of Israel is mine, the first male birth of man or beast: on the day when I sent death on all the first sons in the land of Egypt, I made them mine.
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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.