Numbers 4:22-24

New Revised Standard Version Catholic Edition

²² Take a census of the Gershonites also, by their ancestral houses and by their clans; ²³ from thirty years old up to fifty years old you shall enroll them, all who qualify to do work in the tent of meeting. ²⁴ This is the service of the clans of the Gershonites, in serving and bearing burdens: