After seven days of investiture into the Priesthood, Aaron and his sons assume their offices and offer communal sacrifices on the EIGHTH day (Shemini). A fire from God, symbolizing Divine blessing, consumed their offerings.
Two of Aaron’s sons, Nadav and Avihu, brought an incense offering on their own initiative, and are struck down by God for their actions. Instructions from God and Moses to Aaron and his remaining sons with respect to public displays of grief make it amply clear that the priests hold a consecrated and elevated position, which takes priority over their personal needs. To prevent a recurrence of priestly error, the priests were warned to refrain from imbibing any intoxicant.
The Sidra concludes with a thorough exposition of the laws of Kashrut: a listing of the permissible and prohibited animals and certain physical features establish these criteria.