In Context

18 "See that the Kohathite tribal clans are not cut off from the Levites.

19 So that they may live and not die when they come near the most holy things, do this for them: Aaron and his sons are to go into the sanctuary and assign to each man his work and what he is to carry.

20 But the Kohathites must not go in to look at the holy things, even for a moment, or they will die."

21 The Lord said to Moses,

22 "Take a census also of the Gershonites by their families and clans.

23 Count all the men from thirty to fifty years of age who come to serve in the work at the Tent of Meeting.

Numbers 4:21 in Other Translations