Numbers 4:3

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 4:3  (King James Version)
From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.