Leviticus 8:23-24

23And he killed it, and Moses took some of its blood and put it on the lobe of Aaron's right ear and on the thumb of his right hand and on the big toe of his right foot.

24Then he presented Aaron's sons, and Moses put some of the blood on the lobes of their right ears and on the thumbs of their right hands and on the big toes of their right feet. And Moses threw the blood against the sides of the altar.