Numbers 4:41

39from thirty years old and upward even to fifty years old—everyone who entered into the service for work in the Tent of Meeting,

40even those who were counted of them, by their families, by their fathers’ houses, were two thousand six hundred thirty.

41These 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.

42Those who were counted of the families of the sons of Merari, by their families, by their fathers’ houses,

43from thirty years old and upward even to fifty years old—everyone who entered into the service for work in the Tent of Meeting,