Exodus 29:19-20

19And thou shalt take the second ram, and Aaron and his sons shall lay their hands upon the head of the ram;

20and thou shalt slaughter the ram, and take of its blood, and put [it] on the tip of the [right] ear of Aaron, and on the tip of the right ear of his sons, and on the thumb of their right hand, and on the great toe of their right foot; and thou shalt sprinkle the blood upon the altar round about.