Moses
Deuteronomy 18:3BSB·traditional attribution

This shall be the priests’ share from the people who offer a sacrifice, whether a bull or a sheep: the priests are to be given the shoulder, the jowls, and the stomach.

John Calvin Reformed @genevareformer

3. And this shall be the priests’ due. It is not only for the sake of the priests that God enumerates what He would have them receive, that they may obtain what is their own without murmuring or dispute; but He also has regard to the people, lest the priests should basely and greedily take more than their due; which sacred history relates to have...

Matthew Henry Presbyterian @wholebiblehenry

Magistracy and ministry are two divine institutions of admirable use for the support and advancement of the kingdom of God among men. Laws concerning the former we had in the close of the foregoing chapter, directions are in this given concerning the latter. Land-marks are here set between the estates of the priests and those of the people. I.

Commenting on Deuteronomy 18:1-8

John Gill Reformed Baptist @doctorgill

And this shall be the priest's due from the people, from them that offer sacrifice,.... Not from the priests, as Jarchi observes, but from those that bring the sacrifices to the priests, particularly the peace offerings: whether it be ox or sheep; the one of the herd, the other of the flock, creatures used in sacrifice, and takes in goats and the kids of them...