Numbers 4:21-23

Authorized (King James) Version

²¹ And the Lord spake unto Moses, saying, ²² Take also the sum of the sons of Gershon, throughout the houses of their fathers, by their families; ²³ from thirty years old and upward until fifty years old shalt thou number them; all that enter in to perform the service, to do the work in the tabernacle of the congregation.