Numbers 4:29-33 - Duties Of The Merarites
29 "[For] the descendants of Merari according to their clans, according to {their families}, you will muster them; 30 from {those thirty years old} and above until {fifty years old}; you will muster them, all who come to do the work of the tent of assembly. 31 And this [is] the responsibility of {those who are to carry}, all their work in the tent of assembly: the frames of the tabernacle and its bars, pillars, and bases, 32 and the pillars of the courtyard all around, and their bases, pegs, and cords, with all their vessels and for all their work. You will appoint by name the vessels that they [are] responsible to carry. 33 This [is] the work of the clan of the descendants of Merari, for all their work in the tent of assembly {under the direction} of Ithamar son of Aaron the priest."