Moses
Leviticus 8:12ESV·traditional attribution

And he poured some of the anointing oil on Aaron’s head and anointed him to consecrate him.

Matthew Henry Presbyterian @wholebiblehenry

God had given Moses orders to consecrate Aaron and his sons to the priests' office, when he was with him the first time upon mount Sinai, Ex. 28 and Exo 29:1, where we have also the particular instructions he had how to do it. Now here we have, I. The orders repeated. What was there commanded to be done is here commanded to be done now, Lev 8:2, Lev 8:3.

Commenting on Leviticus 8:1-13

John Gill Reformed Baptist @doctorgill

And he poured of the anointing oil upon Aaron's head,.... Which ran down to his beard, and to the collar of his coat, the robe of the ephod, but not to the skirts of his garments, as we wrongly render it, Psa 133:2.

Keil & Delitzsch Lutheran @keilanddelitzsch

Lev 8:6-13 The washing, clothing, and anointing. - Lev 8:6. “Moses brought Aaron and his sons, and washed them with water;” i.e., directed them to wash themselves, no doubt all over, and not merely their hands and feet. This cleansing from bodily uncleanness was a symbol of the putting away of the filth of sin; the washing of the body, therefore, was a symbol of...

Commenting on Leviticus 8:6-13