Leviticus 14:13-14

13“Then he is to slaughter the male lamb in the place where they slaughter the sin offering and the burnt offering, in the Sanctuary area. For the sin offering like the trespass offering belongs to the kohen. It is most holy.

14Then the kohen is to take some of the blood of the trespass offering and dab it on the tip of the right ear of the one being cleansed, on the thumb of his right hand and on the big toe of his right foot.