Leviticus 8:23-24

23and Moses slaughtered it. Then Moses took some of its blood and applied it to the lobe of Aaron’s right ear, the thumb of his right hand, and the big toe of his right foot.

24Next Moses presented Aaron’s sons and applied some of the blood to the lobes of their right ears, the thumbs of their right hands, and the big toes of their right feet. He then splattered the rest of the blood against all sides of the altar.