2 Chronicles

These were the sons of Levi after the house of their fathers; even the chief of the fathers, as they were counted by number of names by their polls, that did the work for the service of the house of the Lord, from the age of twenty years and upward.

For by the last words of David the Levites were numbered from twenty years old and above:

From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.

Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them.

And those that were numbered of the sons of Gershon, throughout their families, and by the house of their fathers,