Moses
Numbers 3:51ESV·traditional attribution

And Moses gave the redemption money to Aaron and his sons, according to the word of the LORD, as the LORD commanded Moses.

Matthew Henry Presbyterian @wholebiblehenry

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

Keil & Delitzsch Lutheran @keilanddelitzsch

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