Bamidbar 4:27-29

Orthodox Jewish Bible

²⁷ At the appointment of Aharon and his banim shall be all the Avodat Bnei Gershoni, in all their massa (burdens), and in all their avodah (service); and ye shall appoint unto them in mishmeret (guard duty responsibility) for all their massa (burdens).

²⁸ This is the Avodat Mishpekhot Bnei Gershoni in the Ohel Mo’ed; and misheret (guard duty responsibility) shall be under the direction of Itamar ben Aharon HaKohen.

²⁹ As for the Bnei Merari, thou shalt number them after their mishpekhot, by the bais of their avot;