1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
16:37And he leaveth there before the ark of the covenant of Jehovah, for Asaph and for his brethren, to minister before the ark continually, according to the matter of a day in its day,
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.