Thou shalt write Aaron’s name upon the rod of Levi - The Levites had taken part in the late outbreak. It was therefore necessary to vindicate the supremacy of the house of Aaron over them; and accordingly his name was written on the rod of Levi, although being the son of Kohath, the second son of Levi (Exodus 6:16 ff), he would not be the natural head of the tribe.
Related Commentaries of Numbers 17:3
Numbers 17:3
3 And thou shalt write Aaron's name upon the rod of Levi: for one rod shall be for the head of the house of their fathers.