Nadab and Abihu, sons of Aaron, each take his censer, put fire and incense in it and offer unauthorized fire before the Lord, which he had not commanded. At once fire comes out from the presence of the Lord and consumes them, and they die before him. Moses tells Aaron this is what the Lord meant: he will be treated as holy by those who are near him and will be glorified before all the people. Aaron is silent.
Moses calls Mishael and Elzaphan, cousins of Aaron, who carry the bodies out of the camp. Moses tells Aaron and his sons Eleazar and Ithamar not to let their hair hang loose, not to tear their clothes and not to leave the entrance of the tent, so that they do not die too; the people, however, may mourn. Then the Lord speaks to Aaron: they must not drink wine or strong drink when they enter the tent, so that they can distinguish between the holy and the common, between the clean and the unclean, and teach the people.
Moses instructs Aaron how to eat the offerings that belong to the priests. When he looks for the goat of the sin offering and finds it burned, he is angry with Eleazar and Ithamar. Aaron answers that on that day, after what had happened, it would not have seemed right to the Lord for them to eat, and Moses is satisfied.