Korah rebels
Korah and some other Israelites rebelled against Moses. Moses told them to burn incense before God the next day, and God would show who was holy.
Key passages
Nu 16:1–17

Now Korah son of Izhar, son of Kohath, son of Levi, and Dathan and Abiram sons of Eliab, and On son of Peleth, the descendants of Reuben, took two hundred and fifty men from the Israelites, leaders of the community summoned from the assembly, renowned men, …

See also
Nu 27:3; Jud 11;