Moses
Leviticus 1:5BSB·traditional attribution

And he shall slaughter the young bull before the LORD, and Aaron’s sons the priests are to present the blood and splatter it on all sides of the altar at the entrance to the Tent of Meeting.

John Calvin Reformed @genevareformer

5. And he shall kill the bullock. The ceremony of killing is subjoined, viz., that the priest should prepare the victim itself, and pour its blood upon the altar, for it was not allowable for a private person to kill the victim with his own hands, but what the priest did in their name was transferred to them.

Matthew Henry Presbyterian @wholebiblehenry

If a man were rich and could afford it, it is supposed that he would bring his burnt-sacrifice, with which he designed to honour God, out of his herd of larger cattle. He that considers that God is the best that is will resolve to give him the best he has, else he gives him not the glory due unto his name.

Commenting on Leviticus 1:3-9

John Gill Reformed Baptist @doctorgill

And he shall kill the bullock before the Lord,.... That is, the man that brings the burnt offering, for no other is yet spoken of; and according to the traditions of the elders (h), killing of the sacrifice was right when done by strangers, by women, and by servants, and by unclean persons, even in the most holy things so be it that the unclean...