Numbers 4:45-47

International Standard Version

⁴⁵ from the tribes of the descendants of Merari, whom Moses and Aaron numbered according to what the Lord had said, under the supervision of Moses.

⁴⁶ The total of those who were numbered from the descendants of Levi by Moses and Aaron; that is, from the leaders of Israel counted according to their tribes and ancestral houses ⁴⁷ from 30 to 50 years old, who entered the service for work at the Tent of Meeting