Exodus 29:19-20

19"You shall take the other ram, and Aaron and his sons shall lay their hands on the head of the ram,

20and you shall kill the ram and take part of its blood and put it on the tip of the right ear of Aaron and on the tips of the right ears of his sons, and on the thumbs of their right hands and on the great toes of their right feet, and throw the rest of the blood against the sides of the altar.