The New Testament refers to God as the author of the Old Testament more than fifty times. If a court were convened to determine the truth of inspiration, Jesus and the New Testament writers would top the witness list. In addition to the New Testament's claims on behalf of the Old Testament, it also claims divine inspiration for itself. The biblical phrases “prophecy of scripture” and “the prophetic word” refer to both the Old and the New Testaments. This chapter presents the biblical testimony supporting its claim of divine inspiration.