So Moses listed them according to the word of the LORD, as he was commanded.
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, I. By what rule they were numbered: Every male from a month old and upward, Num 3:15.
Commenting on Numbers 3:14-39
And Moses numbered them according to the word of the Lord,.... Took the account of all of a month old in the several houses and families of the tribe of Levi; though Moses is only here mentioned, yet it seems from Num 3:39; that Aaron was concerned with him in it; yea, in an after numbering of the Levites who were fit for business from...
Num 3:14-20 The muster of the Levites included all the males from a month old and upwards, because they were to be sanctified to Jehovah in the place of the first-born; and it was at the age of a month that the latter were either to be given up or redeemed (comp. Num 3:40 and Num 3:43 with Num 18:16).
Commenting on Numbers 3:14-20