Leviticus 14:13-14

13Then he shall kill the lamb in the place where he kills the sin offering and the burnt offering, in a holy place; for as the sin offering is the priest’s, so is the trespass offering. It is most holy.

14The priest shall take some of the blood of the trespass offering, and the priest shall put it on the tip of the right ear of him who is to be cleansed, on the thumb of his right hand, and on the big toe of his right foot.