Numbers 16:40-43

16:40 It was a memorial for the Israelites, that no outsider who is not a descendant of Aaron should approach to burn incense before the Lord, that he might not become like Korah and his company – just as the Lord had spoken by the authority of Moses. 16:41 But on the next day the whole community of Israelites murmured against Moses and Aaron, saying, “You have killed the Lord’s people!” 16:42 When the community assembled against Moses and Aaron, they turned toward the tent of meeting – and the cloud covered it, and the glory of the Lord appeared. 16:43 Then Moses and Aaron stood before the tent of meeting.