Moses slaughtered the ram and took some of its blood and put it on Aaron’s right earlobe, on the thumb of his right hand, and on the big toe of his right foot.
The covenant of priesthood must be made by sacrifice, as well as other covenants, Psa 50:5. And thus Christ was consecrated by the sacrifice of himself, once for all. Sacrifices of each kind must be offered for the priests, that they might with the more tenderness and concern offer the gifts and sacrifices of the people, with compassion on the ignorant, and on those that...
Commenting on Leviticus 8:14-30
And he slew [it]; and Moses took of the blood of it, and put [it] upon the tip of Aaron's right ear, and upon the thumb of his right hand, and upon the great toe of his right foot. (f) Moses did this because the priests were not yet established in their office.
Put it upon the tip of Aaron's right ear, etc. - See this significant ceremony explained in the note on Exo 29:20 (note). Calmet remarks that the consecration of the high priest among the Romans bore a considerable resemblance to the consecration of the Jewish high priest.