Why are obligatory sacrifices not mentioned in Devarim? Apparently there is an essential distinction between atonement in Vayikra and atonement in Devarim. In Vayikra the essence of sanctity stems from the Mishkan, and the nation's atonement is achieved through the work of the Kohanim. In Devarim, the essence of Kedusha is embodied by the nation; the sins of Am Yisrael are forgiven through prayer and teshuva.