First Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
25:21et ait David vere frustra servavi omnia quae huius erant in deserto et non periit quicquam de cunctis quae ad eum pertinebant et reddidit mihi malum pro bono
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.