Exodus 29:19-20

19“Then you shall take the other ram, and Aaron and his sons shall lay their hands on the head of the ram.

20Then you shall kill the ram, and take some of its blood and put it on the tip of the right ears of Aaron and his sons and on the thumbs of their right hands and on the big toes of their right feet, and sprinkle the [rest of the] blood around on the altar [of burnt offering].