Numbers 4:34-36

American Standard Version

³⁴ And Moses and Aaron and the princes of the congregation numbered the sons of the Kohathites by their families, and by their fathers’ houses, ³⁵ from thirty years old and upward even unto fifty years old, every one that entered upon the service, for work in the tent of meeting: ³⁶ and those that were numbered of them by their families were two thousand seven hundred and fifty.