“Bring your brother Aaron near with his sons from among Bnei-Yisrael, so that they may minister to Me as kohanim—Aaron and his sons Nadab and Abihu, Eleazar and Ithamar.
Now Aaron’s sons Nadab and Abihu each took his own censer, put fire in it, laid incense over it, and offered unauthorized fire before Adonai—which He had not commanded them.
Moses spoke to Aaron and to Eleazar and Itamar his surviving sons: “Take the grain offering left over from Adonai’s offerings by fire, and eat it without hametz beside the altar, for it is most holy.