1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
16:37And he left there, before the ark of the covenant of Jehovah, Asaph and his brethren, to do the service before the ark continually, as every day's duty required;
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.