Numbers 4:34-36

King James Version

³⁴ And Moses and Aaron and the chief of the congregation numbered the sons of the Kohathites after their families, and after the house of their fathers,

³⁵ 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:

³⁶ And those that were numbered of them by their families were two thousand seven hundred and fifty.