The total number of Levites that Moses and Aaron counted by their clans at the LORD’s command, including all the males a month old or more, was 22,000.
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 the Lord said unto Moses,.... After he had taken the number of the Levites: number all the firstborn of the children of Israel, from a month old and upward, and take the number of their names; that they might be compared with the number of the Levites, and the difference between them observed.
twenty and two thousand--The result of this census, though made on conditions most advantageous to Levi, proved it to be by far the smallest in Israel. The separate numbers stated in Num 3:22, Num 3:28, Num 3:34, when added together, amount to twenty-two thousand three hundred.