Numbers 4:41

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.

⁴¹  These are they that were numbered of the families of the sons of Gershon, of all that might do service in the tabernacle of the congregation, whom Moses and Aaron did number according to the commandment of the LORD.

⁴²  And those that were numbered of the families of the sons of Merari, throughout their families, by the house of their fathers,

⁴³  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,