Bamidbar 4:28-30

Orthodox Jewish Bible

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;

³⁰ From shloshim shanah (thirty years old) and upward even until chamishim shanah (fifty years old) shalt thou number them, every one that entereth into the tz’va (holy militia service of Hashem), to do the work of the Avodat Ohel Mo’ed.