Moses
Leviticus 9:19ESV·traditional attribution

But the fat pieces of the ox and of the ram, the fat tail and that which covers the entrails and the kidneys and the long lobe of the liver—

Matthew Henry Presbyterian @wholebiblehenry

These being the first offerings that ever were offered by the levitical priesthood, according to the newly-enacted law of sacrifices, the manner of offering them is particularly related, that it might appear how exactly they agreed with the institution. 1.

Commenting on Leviticus 9:8-22

John Gill Reformed Baptist @doctorgill

And they put the fat upon the breasts,.... Both of the bullock and of the ram, while they were waving: and he burnt the fat upon the altar; after having been waved.

Keil & Delitzsch Lutheran @keilanddelitzsch

Lev 9:15-21 Of the sacrifices of the nation, Aaron presented the sin-offering in the same manner as the first, i.e., the one offered for himself (Lev 9:8.). The blood of this sin-offering, which was presented for the congregation, was not brought into the holy place according to the rule laid down in Lev 7:16., but only applied to the horns of the altar of burnt-offering...

Commenting on Leviticus 9:15-21