Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
1:9nunc igitur Domine Deus impleatur sermo tuus quem pollicitus es David patri meo tu enim fecisti me regem super populum tuum multum qui tam innumerabilis est quam pulvis terrae
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.