Numbers 4:34-36

Amplified Bible

³⁴ So Moses and Aaron and the leaders of the congregation numbered the sons of the Kohathites by their families (clans) and by their fathers’ households, ³⁵ from thirty years and upward even to fifty years old, everyone who enters the service to do the work in the Tent of Meeting (tabernacle); ³⁶ the men who were numbered by their families were 2,750.