One Isaiah or Three?
The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem, in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah.Isaiah 1:1 · World English Bible
Original Language & Text
Scholars observe pronounced shifts in Hebrew vocabulary, style, and historical setting between chapters 1-39, 40-55, and 56-66. Chapters 1-39 largely address 8th-century Judah under Assyrian threat, using vocabulary and oracular forms typical of pre-exilic prophecy and naming the historical prophet Isaiah ben Amoz directly. Chapters 40-55 shift dramatically in tone to comfort and restoration, addressing an audience already in Babylonian exile as a present reality, using distinct recurring vocabulary ('servant,' 'former things/new things,' extensive courtroom/trial imagery) largely absent from 1-39, and famously naming the Persian king Cyrus (45:1) as a current or imminent historical figure—more than a century after Isaiah ben Amoz's lifetime. Chapters 56-66 shift again, addressing post-exilic concerns (rebuilt Jerusalem, temple worship disputes, Sabbath observance controversies) with yet another stylistic profile, leading many scholars to see a third distinct layer or school of authorship.
History & Authorship
Medieval Jewish commentator Abraham Ibn Ezra (12th century) subtly hinted at difficulties with unified authorship, though full skepticism didn't emerge until German rationalist scholarship. Johann Christoph Doderlein (1775) first clearly proposed a separate 'Deutero-Isaiah' for chapters 40-66, and Bernhard Duhm (1892) further divided a 'Trito-Isaiah' (56-66) from Deutero-Isaiah (40-55), a three-part division that became the dominant scholarly model. This view was reinforced by comparative study of ancient Near Eastern prophecy and later scholars such as Claus Westermann and Joseph Blenkinsopp elaborated redactional and compositional theories describing Isaiah as a multi-century 'school' or tradition rather than a single author. The Great Isaiah Scroll (1QIsa-a) from Qumran, dating to roughly the 2nd century BCE, demonstrates the book already circulated as one continuous unified scroll by that time—showing textual unification occurred centuries before modern scholarship, though this speaks to the book's final compiled form rather than settling the question of original authorship.
The Popular / Mainstream View
The traditional Jewish and Christian view holds that the entire 66-chapter book was written by a single prophet, Isaiah ben Amoz, active in Jerusalem in the 8th century BCE (Isaiah 1:1, 6:1), with the later chapters representing genuine predictive prophecy—including naming King Cyrus of Persia over a century before his birth and, for Christians, prophesying the suffering servant later applied to Jesus (Isaiah 53). This remains the standard confessional position in Orthodox Judaism and most conservative Protestant and Catholic scholarship, which regards the book's own attribution and its predictive fulfillment as evidence of unified, divinely inspired authorship.
Minority & Alternative Views
Deutero-Isaiah (chapters 40-55)
The majority view among critical scholars holds that chapters 40-55 were written by an anonymous prophet during the Babylonian exile (mid-6th century BCE), addressing exiles as contemporaries and referring to Cyrus's conquest as a current or very near event rather than distant prediction. This author is sometimes called 'Second Isaiah' and their material was later attached to the original Isaiah's scroll.
Trito-Isaiah (chapters 56-66)
Many of the same scholars further distinguish a third author or group active after the return from exile (late 6th-5th century BCE), addressing concerns specific to the restored but struggling Jerusalem community, such as temple worship disputes and social inequality, distinguishing this material stylistically from both earlier sections.
Isaianic school/redactional layers
Some scholars (e.g., Joseph Blenkinsopp) argue the divisions are less clean than three discrete authors, proposing instead a long process of composition and editorial supplementation by a 'school' of tradents working in Isaiah's name across several centuries, with the book reaching final form only in the Persian or early Hellenistic period.
What Scholars Say
There is broad consensus in academic biblical scholarship that Isaiah 1-39, 40-55, and 56-66 reflect different historical settings and were not composed by one 8th-century individual, based on the change in addressed audience, explicit historical references, and vocabulary/style shifts. This multiple-authorship view has been mainstream since the late 19th century and is taught in virtually all critical seminaries and university religion departments. It remains a minority view among lay believers and is rejected by many confessional and conservative scholars, who argue the book's literary and thematic unity (recurring themes of divine sovereignty, holiness, and messianic hope) and its treatment as one book throughout Jewish and Christian history and at Qumran outweigh the internal stylistic evidence.
Sources & Further Reading
- Bernhard Duhm, Das Buch Jesaia (1892)
- Joseph Blenkinsopp, Anchor Bible Isaiah commentaries
- Claus Westermann, Isaiah 40-66: A Commentary
- Great Isaiah Scroll (1QIsa-a), Dead Sea Scrolls, c. 2nd century BCE
- Johann Christoph Doderlein (1775)
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