Numbers 4:22-24

American Standard Version

²² Take the sum of the sons of Gershon also, by their fathers’ houses, by their families; ²³ from thirty years old and upward until fifty years old shalt thou number them; all that enter in to ^[a]wait upon the service, to do the work in the tent of meeting. ²⁴ This is the service of the families of the Gershonites, in serving and in bearing burdens: