Numbers 4:37-39

21st Century King James Version

³⁷ These were they that were numbered of the families of the Kohathites, all who might do service in the tabernacle of the congregation, whom Moses and Aaron numbered according to the commandment of the Lord by the hand of Moses.

³⁸ And those who 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 who entereth into the service for the work in the tabernacle of the congregation”