Our Sedra begins by discussing the events which occurred on the 8th & final day of the consecration service in the Mishkan on the 1st of Nisan. After months of preparation & anticipation, Ahron & his sons are finally installed as Kohanim in an elaborate service led by Moshe Rabbeinu.

Ahron blesses the people and the entire nation and rejoices. But the excitement comes to an abrupt halt: Ahron’s two eldest sons, Nadav & Avihu, are consumed by a Heavenly fire & die in the Mishkan while offering "strange fire" on the Mizbeyach as part of the Ketoret offering.
Ahron is dumbstruck by the events, & then is told by Moshe that Hashem is sanctified through the sacrifice of His holy ones.

Ahron is then told that Kohanim may not enter the Mishkan while intoxicated.

The Parsha concludes by delving into the laws of Kashrut & various laws of tumah, ritual impurity.