Bamidbar 4:29-31

Orthodox Jewish Bible

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.

³¹ And this is their mishmeret (guard) massa (burden), according to all their Avodah (Service, Ministry) in the Ohel Mo’ed; the frames of the Mishkan, and the crossbars thereof, and the posts thereof, and bases thereof,