Numbers 4:29-31

American Standard Version

²⁹ As for the sons of Merari, thou shalt number them by their families, by their fathers’ houses; ³⁰ from thirty years old and upward even unto fifty years old shalt thou number them, every one that entereth upon the service, to do the work of the tent of meeting. ³¹ And this is the charge of their burden, according to all their service in the tent of meeting: the boards of the tabernacle, and the bars thereof, and the pillars thereof, and the sockets thereof,