Numbers 4:42-45

42And those that were numbered of the families of the sons of Merari, throughout their families, by the house of their fathers, 43From thirty years old and upward even to fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation, 44Even those that were numbered of them after their families, were three thousand and two hundred. 45These are those that were numbered of the families of the sons of Merari, whom Moses and Aaron numbered according to the word of the LORD by the hand of Moses.