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This article is about the biblical person Isaiah. For the name, its variants and other name bearers, see Isaiah (name).
Isaiah (also Isaias; Hebrew יְשַׁעְיָהוּ Jəšaʿjā́hû; Greek Ἠσαΐας Ēsaḯas) was the first major scriptural prophet of the Hebrew Bible.
He worked between 740 and 701 B.C. in the southern kingdom of Judah and proclaimed the judgment of God (YHWH) to this as well as to the northern kingdom of Israel and the advancing great empire of Assyria. But he also promised the Israelites an eschatological turn to salvation, that is, to universal peace and justice, and announced for the first time a future Messiah as a righteous judge and savior of the poor.
The book of the same name in the Bible records his prophecy in chapters 1-39, which since 1892 has been referred to as Proto-Isaiah.
In contrast, almost all biblical scholarship attributes the book portions further back in time as Deutero-Isaiah (Isa 40-55) and Trito-Isaiah (Isa 56-66) to later, exilic-post-exilic prophets and their tradites, who attributed their material to the historical Isaiah of the Assyrian period (8th and 7th centuries BC).
Almost all biblical scholarship assumes a unified book of Isaiah around 200 BC in Jesus Sirach. The oldest known complete Hebrew manuscript of the book, the Great Isaiah Scroll, was produced no later than 150 BC. It plays a prominent role in rabbinic Judaism (Talmud) and in early Christianity (New Testament). In the Jewish biblical canon it opens the series of the "back" prophets, in the Christian canon the series of the "great" prophets.

