Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
29:17coeperunt autem prima die mensis primi mundare et in die octava eiusdem mensis ingressi sunt porticum templi Domini expiaveruntque templum diebus octo et in die sextadecima mensis eiusdem quod coeperant impleverunt
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.