“you shall count them from thirty years old and upward until fifty years old: all who enter in to wait on the service, to do the work in the Tent of Meeting.”
Numbers 4:23 (WEB)
Context Reading
21Yahweh spoke to Moses, saying, 22“Take a census of the sons of Gershon also, by their fathers’ houses, by their families; 23you shall count them from thirty years old and upward until fifty years old: all who enter in to wait on the service, to do the work in the Tent of Meeting. 24“This is the service of the families of the Gershonites, in serving and in bearing burdens: 25they shall carry the curtains of the tabernacle and the Tent of Meeting, its covering, the covering of sealskin that is on it, the screen for the door of the Tent of Meeting,