Numbers 17:3

Aaron's name Rather than Levi's, for that would have left the controversy undecided between Aaron and the other Levites, whereas this would justify the appropriation of the priesthood to Aaron's family. One rod There shall be in this, as there is in all the other tribes, only one rod, and that for the head of their tribe, who is Aaron in this tribe: whereas it might have been expected that there should have been two rods, one for Aaron and another for his competitors of the same tribe. But Aaron's name was sufficient to determine both the tribe, and that branch or family of the tribe to whom this dignity should be affixed.