and to the priests enrolled according to their families in the genealogy, as well as to the Levites twenty years of age or older, according to their responsibilities and divisions.
KJV
Both to the genealogy of the priests by the house of their fathers, and the Levites from twenty years old and upward, in their charges by their courses;
ASV
and them that were reckoned by genealogy of the priests by their fathers’ houses, and the Levites from twenty years old and upward, in their offices by their courses;