Moses
Numbers 3:51BSB·traditional attribution

And Moses gave the redemption money to Aaron and his sons in obedience to the word of the LORD, just as the LORD had commanded him.

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