Numbers 4:41

³⁹from five and twenty years old and upward till fifty years old, everyone that goes in to minister and to do the services in the tabernacle of witness.

⁴⁰And the numbering of them according to their families, according to the houses of their lineage, was two thousand six hundred and thirty.

— Numbers 4:41 —

⁴²And also the family of the sons of Merari were numbered according to their divisions, according to the house of their fathers;

⁴³from five and twenty years old and upward till fifty years old, everyone that goes in to minister in the services of the tabernacle of witness.