Third Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
11:34nec auferam omne regnum de manu eius sed ducem ponam eum cunctis diebus vitae suae propter David servum meum quem elegi qui custodivit mandata mea et praecepta mea
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.