and to the priests who were written in the genealogy according to their father’s house, and to the Lĕwites from twenty years old upward, by their duties in their divisions,
These were the registered ones of the clans of the sons of Merari, whom Mosheh and Aharon registered according to the mouth of יהוה by the hand of Mosheh.
from thirty years old and above, even to fifty years old, all who came to do the work of service and the work of bearing burdens in the Tent of Appointment,