First Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
Chapter 24
19hae vices eorum secundum ministeria sua ut ingrediantur domum Domini et iuxta ritum suum sub manu Aaron patris eorum sicut praecepit Dominus Deus Israhel
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.