Leviticus 8:23-24

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

24Then he brought Aaron’s sons. And Moses put some of the blood on the tips of their right ears, on the thumbs of their right hands, and on the big toes of their right feet. And Moses sprinkled the blood all around on the altar.