Numbers 4:39 in the World English Bible
from thirty years old and upward even to fifty years old—everyone who entered into the service for work in the Tent of Meeting,
Context
38 And those that were numbered of the sons of Gershon, throughout their families, and by the house of their fathers,
39 From thirty years old and upward even unto fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation,
40 Even those that were numbered of them, throughout their families, by the house of their fathers, were two thousand and six hundred and thirty.