Num 17:2

“We can also learn from other sources how awesome was the dignity of the priesthood. Indeed, there was a day when some wicked and evil men revolted against Aaron, quarreled with him over his position in the community and tried to drive him from his leadership. Moses, the mildest of men, wanted to persuade them by the facts themselves that he had not brought Aaron to the leadership because he was a brother, relative or member of his family but that it was in obedience to God's decree that he had entrusted the priesthood to him. So he ordered each tribe to bring a staff, and Aaron was instructed to do the same.When each tribe had brought a staff, Moses took all of them and put them inside the meeting tent. Once he had put them there, he gave orders that they await the decision of God which would come to them through those staves. Then all the other staves kept their same appearance, but a single one—Aaron's—blossomed and put forth leaves and fruit. So the Lord of nature used leaves instead of letters to teach them that he had again elected Aaron.”