Leviticus 14:13-14

13Then he is to slaughter the lamb in the sanctuary area where the sin offering and burnt offering are slaughtered. Like the sin offering, the guilt offering belongs to the priest; it is most holy.

14The priest is to take some of the blood from the guilt offering and put it on the right earlobe of the one to be cleansed, on the thumb of his right hand, and on the big toe of his right foot.