“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;”
King James Version (KJV)
23:28 Holy things - Holy places, and garments, and vessels, andsacrifices, which were to be washed and cleansed from any filthinessthat might cleave to them.