Read 1 Chronicles 23:28 Using Other Translations
Because their office was to wait on the sons of Aaron for the service of the house of the LORD, in the courts, and in the chambers, and in the purifying of all holy things, and the work of the service of the house of God;
For their duty was to assist the sons of Aaron for the service of the house of the LORD, having the care of the courts and the chambers, the cleansing of all that is holy, and any work for the service of the house of God.
The work of the Levites was to assist the priests, the descendants of Aaron, as they served at the house of the LORD . They also took care of the courtyards and side rooms, helped perform the ceremonies of purification, and served in many other ways in the house of God.