Numbers 4:34 MSG

[34] Moses, Aaron, and the leaders of the congregation counted the Kohathites by clan and family. All the men from thirty to fifty years of age who came to serve in the work in the Tent of Meeting, counted by clans, were 2,750. This was the total from the Kohathite clans who served in the Tent of Meeting. Moses and Aaron counted them just as God had commanded through Moses.