These were the sons of Levi after their fathers' houses, even the heads of the fathers of those of them that were counted, in the number of names by their polls, who did the work for the service of the house of LORD, from twenty ye
This is that which belongs to the Levites: From twenty-five years old and upward they shall go in to wait upon the service in the work of the tent of meeting.
besides those who were reckoned by genealogy of males, from three years old and upward, even everyone that entered into the house of LORD, as the duty of every day required, for their service in their offices according to their div