Numbers 4:42 in the King James Version
And those that were numbered of the families of the sons of Merari, throughout their families, by the house of their fathers,
Context
41 These are those who were counted of the families of the sons of Gershon, all who served in the Tent of Meeting, whom Moses and Aaron counted according to the commandment of the LORD.
42 Those who were counted of the families of the sons of Merari, by their families, by their fathers’ houses,
43 from thirty years old and upward even to fifty years old—everyone who entered into the service for work in the Tent of Meeting,