Korah was not content to become a ‘lay’ Levite. He wanted to become a priest, which was reserved for the family of Aaron. He argued that the whole community was holy, so why did Aaron and Moses set themselves apart from the rest of the Israelites? Korah, indeed, was set apart, although not for priesthood, but for going down to the land of the dead while he was still alive. Nobody went to Sheol while he or she was still alive. You died first before you went to the land below (literally, as the Israelites were buried after they died). But Korah went down when he was still alive, as the land below him opened up and swallowed him. He, in some sense, got what he wished for. He was set apart from everyone else.