Numbers 4:42-45

The numbered men of the families of the sons of Merari by their families, by their fathers’ households, from thirty years and upward even to fifty years old, everyone who entered the service for work in the tent of meeting. Their numbered men by their families were 3,200. These are the numbered men of the families of the sons of Merari, whom Moses and Aaron numbered according to the commandment of the LORD through Moses.