Numbers 4:42-45

42And those that were numbered of the families of the sons of Merari, after their families, according to their fathers' houses,

43from thirty years old and upward even to fifty years old, every one that entered into the labour, for service in the tent of meeting,

44even those that were numbered of them according to their families, were three thousand two hundred.

45These are they that were numbered of the families of the sons of Merari, whom Moses and Aaron numbered according to the commandment of Jehovah through Moses.