Leviticus 14:13-14

13He shall kill the male lamb in the place where they kill the sin offering and the burnt offering, in the sacred place [the courtyard of the tabernacle]; for the guilt offering, like the sin offering, belongs to the priest; it is most holy.

14The priest shall 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, and on the thumb of his right hand, and on the big toe of his right foot.