Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
23:6nec quisquam alius ingrediatur domum Domini nisi sacerdotes et qui ministrant de Levitis ipsi tantummodo ingrediantur quia sanctificati sunt et omne reliquum vulgus observet custodias Domini
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.