office
That is, their new office, since their former office of bearing the tabernacle was ended.
Related Commentaries of 1 Chronicles 23:28
1 Chronicles 23:28
28 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;