Isaiah overview

Purpose & Theme

Isaiah is the towering prophet of the Old Testament, so full of the gospel that it has been called “the fifth gospel.” Ministering to the kingdom of Judah in the eighth century BC, as the Assyrian empire threatened to swallow the nations, Isaiah proclaims two great and interwoven truths: the LORD is the thrice-holy God, majestic and utterly pure, who must judge sin; and the LORD is the only Savior, who will redeem a people for Himself through His coming Servant-King. The prophet’s own name, “the LORD saves,” captures the message, and his book moves from searching judgment on Judah, Israel, and the nations, through the folly of trusting armies and idols instead of God, to the promise of a purified remnant and a glorious salvation.

At the heart of Isaiah stands the Messiah, unveiled more fully here than anywhere else in the Old Testament. He is the virgin’s son, Immanuel, “God with us” (7:14); the child born who is “Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace” (9:6); the Spirit-anointed shoot from the stump of Jesse (11:1); the gentle Servant who brings justice to the nations; and, most astonishingly, the Suffering Servant who is “pierced for our transgressions” and bears the sin of many (53:5). The book climaxes in the promise of new heavens and a new earth. Isaiah thus sweeps from the holiness of God and the ruin of sin to the comfort of redemption and the hope of a renewed creation, and it points, more clearly than any other prophet, to Jesus Christ.

Historical Context

Isaiah prophesied for roughly sixty years, “in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah” (1:1), from about 740 to 680 BC. His call came “in the year that King Uzziah died” (chapter 6), around 740 BC, and his ministry spanned the reigns of the faithless Ahaz and the faithful Hezekiah. The dominant power of his day was Assyria, which destroyed the northern kingdom of Israel in 722 BC and besieged Jerusalem under Sennacherib in 701 BC — a crisis at the very center of the book (chapters 36-37), when the LORD miraculously delivered the city.

Isaiah also looks beyond his own century. He foresees the Babylonian exile that would come more than a hundred years later (chapter 39), names Cyrus of Persia who would send the exiles home (44-45), and gazes further still to the coming of the Servant and the new creation. The book is often divided into two great parts: chapters 1-39, set mainly in the Assyrian crisis and dominated by judgment, and chapters 40-66, a “book of comfort” that speaks tenderly to a people facing and returning from exile, and unveils the Servant of the LORD.

Structure & Outline

Isaiah falls into two major movements:

• The Book of Judgment (Chapters 1-39):
  • Judgment and hope for Judah and Jerusalem, with the great messianic promises (1-12)
  • Oracles against the nations (13-23)
  • The “Isaiah Apocalypse”: worldwide judgment and salvation (24-27)
  • Woes and hopes concerning trust in the nations (28-35)
  • Historical interlude: Hezekiah, Sennacherib, and Babylon (36-39)
• The Book of Comfort (Chapters 40-66):
  • The comfort of God and the folly of idols (40-48)
  • The Servant of the LORD and His suffering (49-57)
  • The future glory of Zion and the new creation (58-66)

How This Book Points to Jesus

No prophet is quoted more often in the New Testament than Isaiah, and no book of the Old Testament sets Christ before us more vividly. Isaiah foretells His virgin birth and His name Immanuel, “God with us” (7:14; Matthew 1:23); His divine identity and everlasting kingdom as the child born to reign on David’s throne (9:6-7); His anointing by the Spirit as the righteous branch from Jesse (11:1-5). He is “the voice” whose way John the Baptist prepares (40:3), and the Spirit-anointed herald who proclaims good news to the poor and “the year of the Lord’s favor,” the very passage Jesus read in the synagogue and declared fulfilled in Himself (61:1-2; Luke 4:18-21).

Above all, Isaiah unveils the Servant of the LORD, culminating in the fourth Servant Song (52:13-53:12), the clearest Old Testament portrait of the cross: the Servant despised and rejected, “wounded for our transgressions... crushed for our iniquities,” bearing our sins as a substitute, silent before His shearers, buried with the rich, and yet raised to see the fruit of His anguish and to make many righteous. The New Testament repeatedly applies this passage to the crucified and risen Christ (Acts 8:32-35; 1 Peter 2:22-25). Isaiah ends with the promise of new heavens and a new earth (65-66), the hope fulfilled in Christ and consummated in Revelation. To read Isaiah is to see the gospel drawn in advance — the holy God, the ruin of sin, the redeeming Servant, and the glory to come.