Korach and 250 followers oppose the appointment of Aaron as kohen. The mutineers offer an unlawful ketoret (incense). G-d punishes them by opening up the earth and swallows them.
Aaron offers a ketoret to stop a plague and his staff blossoms and grows almonds to show that hashem supports his appointment as high priest.
The parsha concludes with the description of the terumah and other gifts to to the kohanim.