Second Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
18:12qui dixit ad Ioab si adpenderes in manibus meis mille argenteos nequaquam mitterem manum meam in filium regis audientibus enim nobis praecepit rex tibi et Abisai et Ethai dicens custodite mihi puerum Absalom
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.