Numbers 16:5, 7, 10, 35, 40, 46-48

Then he said to Korah and all his followers: “In the morning the LORD will show who belongs to him and who is holy, and he will have that person come near him. The man he chooses he will cause to come near him.

and tomorrow put burning coals and incense in them before the LORD. The man the LORD chooses will be the one who is holy. You Levites have gone too far!”

He has brought you and all your fellow Levites near himself, but now you are trying to get the priesthood too.

And fire came out from the LORD and consumed the 250 men who were offering the incense.

as the LORD directed him through Moses. This was to remind the Israelites that no one except a descendant of Aaron should come to burn incense before the LORD, or he would become like Korah and his followers.

Then Moses said to Aaron, “Take your censer and put incense in it, along with burning coals from the altar, and hurry to the assembly to make atonement for them. Wrath has come out from the LORD; the plague has started.” So Aaron did as Moses said, and ran into the midst of the assembly. The plague had already started among the people, but Aaron offered the incense and made atonement for them. He stood between the living and the dead, and the plague stopped.