First Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
21:17dixitque David ad Deum nonne ego sum qui iussi ut numeraretur populus ego qui peccavi ego qui malum feci iste grex quid commeruit Domine Deus meus vertatur obsecro manus tua in me et in domum patris mei populus autem tuus non percutiatur
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.