Numbers 3:6

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

Numbers 4:2

4:2 “Take a census of the Kohathites from among the Levites, by their families and by their clans,

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?