Numbers 4:27-29

New Revised Standard Version Catholic Edition

²⁷ All the service of the Gershonites shall be at the command of Aaron and his sons, in all that they are to carry, and in all that they have to do; and you shall assign to their charge all that they are to carry. ²⁸ This is the service of the clans of the Gershonites relating to the tent of meeting, and their responsibilities are to be under the oversight of Ithamar son of Aaron the priest.

²⁹ As for the Merarites, you shall enroll them by their clans and their ancestral houses;