R. Tali Adler on Shemini: The Question in the Middle

Vayikra is a book that is concerned with the holy and the profane; the pure and the impure. Nearly every mitzvah in Vayikra contains these categories. The Jewish people are told that they are to be kadosh because God is kadosh . In Vayikra, it is the holy that is the primary pathway to God. The mishkan (tabernacle), the center of holiness on earth, is the pathway for that connection.