Numbers 16:1-2

1And Korah, the son of Izhar, the son of Kohath, the son of Levi, made bold, and [with him] Dathan and Abiram, the sons of Eliab, and On, the son of Peleth, the sons of Reuben;

2and they rose up against Moses, with two hundred and fifty men of the children of Israel, princes of the assembly, summoned to the council, men of renown;