Moses
Leviticus 6:10ESV·traditional attribution

And the priest shall put on his linen garment and put his linen undergarment on his body, and he shall take up the ashes to which the fire has reduced the burnt offering on the altar and put them beside the altar.

Matthew Henry Presbyterian @wholebiblehenry

Hitherto we have had the instructions which Moses was directed to give to the people concerning the sacrifices; but here begin the instructions he was to give to the priests; he must command Aaron and his sons, Lev 6:9. The priests were rulers in the house of God, but these rulers must be ruled; and those that had the command of others must themselves be commanded.

Commenting on Leviticus 6:8-13

John Gill Reformed Baptist @doctorgill

And the priest shall put on his linen garment,.... "His measure" (q), as the word signifies, a garment that was just the measure of his body, and exactly fitted it; it was a sort of a shirt, which he wore next his body, and reached down to his feet; and in this he always officiated, and was an emblem of the purity and holiness of...

Geneva Bible Notes Reformed @genevanotes

And the priest shall put on his linen garment, and his linen breeches shall he put upon his flesh, and take up the ashes which the fire hath consumed with the burnt offering on the altar, and he shall put them beside the altar. (e) Upon his secret parts, . (f) In the ash pans appointed for that use.