Leviticus 14:13-14

13He must then slaughter the male lamb in the place where the sin offering and the burnt offering are slaughtered, in the sanctuary, because, like the sin offering, the guilt offering belongs to the priest; it is most holy.

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