Numbers 4:41-43

Amplified Bible

⁴¹ These were numbered men of the families of the sons of Gershon, everyone who served in the Tent of Meeting (tabernacle), whom Moses and Aaron numbered just as the Lord had commanded.

⁴² The men who were numbered of the sons of Merari, by their families (clans), by their fathers’ households, ⁴³ from thirty years and upward even to fifty years old, everyone who entered the service for work in the Tent of Meeting (tabernacle);