Leviticus 14:13-14

13He will slaughter the lamb in the holy place where he slaughters the offering for sin and the burnt offering. He will do this because the guilt offering, like the offering for sin, belongs to the priest. It is very holy.

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