These were the sons of Levi by their fathers' houses; even the heads of their fathers' houses, as they were counted individually by the number of their names, 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:

But David took not the number of them from twenty years old and under: because the LORD had said he would increase Israel like the stars of the heavens.

Now the children of Israel according to their number, the heads of the fathers' houses and captains of thousands and hundreds, and their officers that served the king in any matter of the divisions, who came in and went out month by month throughout all the months of the year, of every division were twenty and four thousand.