Bamidbar 4:23-25

Orthodox Jewish Bible

²³ From shloshim shanah (thirty years old) and upward until chamishim shanah (fifty years old) shalt thou number them; all that enter to serve the tz’va (holy militia service of Hashem), to labor in the Avodah in the Ohel Mo’ed.

²⁴ This is the Avodat Mishpekhot Gershoni, as relates to service and massa (burden):

²⁵ And they shall bear the curtains of the Mishkan, and the Ohel Mo’ed, its covering, and the tachash hide covering that is over the top of it, and the screen for the entrance of the Ohel Mo’ed,