Leviticus 14:13-14

13He is to slaughter the lamb in the sanctuary area where the sin offering and the 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 of the guilt offering and put it on the lobe of the right ear of the one to be cleansed, on the thumb of their right hand and on the big toe of their right foot.