Numbers 7:8
and four carts and eight oxen he gave to the sons of Merari, according to
Numbers 3:36-37
Now the appointed duties of the sons of Merari involved the frames of the tabernacle, its bars, its pillars, its sockets, all its equipment, and the service concerning them,
Numbers 4:28-33
This is the service of the families of the sons of the Gershonites in the tent of meeting, and their duties shall be