Numbers 4:30

Overview - Numbers 4
1	The age at which the Levites were to begin to serve, and the duration of the service.
4	The duty of the Kohathites.
16	The charge of Eleazar.
17	The office of the priests.
21	The duty of the Gershonites;
29	of the Merarites.
34	The number of the Kohathites;
38	of the Gershonites
42	and of the Merarites.

Numbers 4:30  (King James Version)
From thirty years old and upward even unto fifty years old shalt thou number them, every one that entereth into the service, to do the work of the tabernacle of the congregation.