The Book of Isaiah (, ) is the first of the Latter Prophets in the Hebrew Bible and the first of the Major Prophets in the Christian Old Testament. It is identified by a as the words of the 8th-century BCE prophet Isaiah ben Amoz, but there is extensive evidence that much of it was composed during the Babylonian captivity and later. Johann Christoph Döderlein suggested in 1775 that the book contained the works of two prophets separated by more than a century, and Bernhard Duhm originated the view, held as a consensus through most of the 20th century, that the book comprises three separate collections of oracles: "Proto-Isaiah" (chapters 1–39), containing the words of the 8th-century prophet Isaiah; "Deutero-Isaiah" (chapters 40–55), the work of an anonymous 6th-century BCE author writing during the Exile; and "Trito-Isaiah" (chapters 56–66), composed after the return from Exile. Isaiah 1–33 promises judgment and restoration for Judah, Jerusalem and the nations, and chapters 34–66 presume that judgment has been pronounced and restoration follows soon. While virtually no scholars today attribute the entire book, or even most of it, to one person, the book's essential unity has become a focus in more recent research.