1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
23:28for their station is at the side of the sons of Aaron, for the service of the house of Jehovah, over the courts, and over the chambers, and over the cleansing of every holy thing, and the work of the service of the house of God,
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.