Nadab and Abihu were two of Aaron’s sons. They got their shallow cups for burning incense. They put fire in them. They added incense to it. They made an offering to the Lord by using fire that wasn’t allowed. They did it against his command.
Then he spoke to Korah and all his followers. He said, “In the morning the Lord will show who belongs to him. He will show who is holy. He’ll bring that person near him. He’ll bring the man he chooses near him.
Tomorrow put burning coals and incense in them. Offer it to the Lord. The man the Lord chooses will be the one who is holy. You Levites have gone too far!”