Parallel
Numbers 4:27
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
At the appointment (note: Heb. mouth) of Aaron and his sons shall be all the service of the sons of the Gershonites, in all their burdens, and in all their service: and ye shall appoint unto them in charge all their burdens.
All the service of the Gershonites—all their transport duties and other work—is to be done at the direction of Aaron and his sons; you are to assign to them all that they are responsible to carry.