Numbers 4:1-3

New King James Version

Duties of the Sons of Kohath

4 Then the Lord spoke to Moses and Aaron, saying: ² “Take a census of the sons of ^(A)Kohath from among the children of Levi, by their families, by their fathers’ house, ^3 (B)from thirty years old and above, even to fifty years old, all who enter the service to do the work in the tabernacle of meeting.