'Offices' in the Bible

Now in accordance with the ordinance of his father David, he appointed the divisions of the priests for their service, and the Levites for their duties of praise and ministering and serving before the priests as every day required, and the gatekeepers by their divisions at every gate; for David the man of God had so commanded.

Also Jehoiada placed the offices and officers of the house of the Lord under the authority of the Levitical priests, whom David had [previously] assigned over the house of the Lord, to offer the burnt offerings of the Lord, as it is written in the Law of Moses, with rejoicing and singing in accordance with the order of David.

without regard to their genealogical registration, to the males from thirty years old and upward—everyone who entered the house of the Lord for his daily obligations—for their service in accordance with their duties by their divisions;

as well as the priests who were registered genealogically according to their fathers’ households, and the Levites from twenty years old and upward, by their duties and by their divisions.