Charles Ellicott Commentary Leviticus 8:24

"And he brought Aaron`s sons; and Moses put of the blood upon the tip of their right ear, and upon the thumb of their right hand, and upon the great toe of their right foot: and Moses sprinkled the blood upon the altar round about." — Leviticus 8:24 (ASV)

And he brought Aaron’s sons. —Having performed these symbolical acts upon the high priest, Moses now repeats the same in the case of the four ordinary priests. The right members were chosen for these symbolical acts because they are represented as the strongest, and are therefore most able to execute the will of God . The cured leper had the same parts of the body touched with the blood of the trespass offering .