Numbers 4:29-33 - Duties Of The Merarites
29 "For the descendants of Merari, number them according to their tribes and ancestral houses 30 from 30 to 50 years old as you count them, including everyone who can enter service and perform work at the Tent of Meeting. 31 This is to be their area of responsibility to carry out with respect to their service at the Tent of Meeting: the board of the tent, its bars, its crossbars, its sockets, 32 the pillars around the courtyard, their sockets, their pegs, their ropes, and all the utensils for all their services. Assign the utensils by name to each person whose responsibility it will be to carry them. 33 This is the work of the tribes of the descendants of Merari with reference to their service at the Tent of Meeting under the supervision of Aaron the priest's son Ithamar."