In Leviticus 10, Aharon (Aaron) and his sons were ordained as priests. In Leviticus 11-12, they are charged with teaching the people of God to distinguish holy from unholy, “clean” from “unclean.” Once we have been taught by our High Priest, Yeshua the Mashiakh (Jesus the Christ), about what is holy and clean, we need to live in that truth. From this we learn how holiness can be just skin-deep if the heart doesn’t change.
Leviticus 13: Leprosy of the soul