Numbers 4:37-39

Complete Jewish Bible

³⁷ These are the ones counted from the K’hat families of all those serving in the tent of meeting, whom Moshe and Aharon enumerated, in keeping with the order given by Adonai through Moshe.

(A: ii) ³⁸ The census of the descendants of Gershon, by their clans and families, ³⁹ all those between thirty and fifty years old who were part of the corps serving in the tent of meeting,