Leviticus 14:13-14

13He is to slaughter the male lamb at the place in the sanctuary area where the sin offering and burnt offering are slaughtered, for like the sin offering, the guilt offering belongs to the priest; it is especially holy.

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