Numbers 3:6

3:6 “Bring the tribe of Levi near, and present them before Aaron the priest, that they may serve him.

Numbers 16:10

16:10 He has brought you near and all your brothers, the sons of Levi, with you. Do you now seek the priesthood also?

Numbers 17:3

17:3 You must write Aaron’s name on the staff of Levi; for one staff is for the head of every tribe.