critical consensus, is that the book of Isaiah contains some prophecies from the eighth-century prophet, along with writings from other authors from the later pre-exilic, exilic and post-exilic eras. While the latter view has been popularized into a schema of three books (1–39; 40–55; 56–66), three eras (pre-exilic, exilic, post-exilic) and three prophetic figures (First Isaiah, Deutero-Isaiah, Third Isaiah), theories are far more complex, with scholars arguing for many hands at work in every section
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