This text examines the use of older biblical texts in Isaiah 40-66, notably the writings attributed to Deutero-Isaiah. Its discussion of allusions, influence, and intertextuality generates significant questions for both biblicists and literary critics: Why do authors allude? How does the presence of older material in a text affect readers? How can critics identify genuine cases of allusion? Are contemporary theories of intertextuality applicable to ancient texts? The author defends the controversial historical questions asked by scholars of inner-biblical exegesis, modifying some of the dominant (and, in some ways, misleading) categories other biblical scholars have created. In sum, the book aims to refine the study of inner-biblical exegesis through an extensive examination of the use of older texts in one corpus. The redactional complexity of the Book of Isaiah has rendered it central to discussions of canon formation and the final shaping of biblical material. The author demonstrates that Deutero-Isaiah situated himself in a wide stream of tradition by no means limited to an Isaianic school, and that his most important literary precursor was not First Isaiah but Jeremiah.This finding necessitates a trenchant reappraisal of recent work on the unity of the Book of Isaiah. Further, the author shows that the strikingly consistent poetics of allusion running throughout all of Isaiah 40-66 testifies to the coherence of those chapters as a single corpus, arguing against multiple authorship.