So Moses collected the redemption money from those in excess of the number redeemed by the Levites.
Here is the exchange made of the Levites for the first-born. 1. The first-born were numbered from a month old, Num 3:42, Num 3:43. Those certainly were not reckoned who, though first-born, had become heads of families themselves, but those only that were under age; and the learned bishop Patrick is decidedly of opinion that none were numbered but those only that were born since...
Commenting on Numbers 3:40-51
Of the firstborn of the children of Israel took he the money,.... Or "for the firstborn", as the Vulgate Latin version renders it, and so the Hebrew particle is sometimes used (u); for children of a month old or little more could not pay the money, but their parents for them, which was paid by them, and Moses received it for the superfluous number of...
Num 3:49-51 “The redeemed of the Levites” are the 22,000 who were redeemed by means of the Levites. In Num 3:50, the Chethibh הפּדים is the correct reading, and the Keri הפּדים an unnecessary emendation. The number of the first-born and that of the Levites has already been noticed in the introduction to Numbers 1.
Commenting on Numbers 3:49-51