Isaiah

Isaiah is one of the great mountains of the Old Testament. It is the longest of the prophetic books and the most quoted book of the Old Testament in the New Testament. Its range is breathtaking: from thundering judgement against Israel, Judah and the surrounding nations, to some of the most tender and exalted promises of comfort, restoration and salvation anywhere in Scripture. It has been called the fifth Gospel, and for good reason. No other Old Testament book anticipates the person and work of Jesus Christ with such clarity and depth.

Isaiah prophesied during one of the most turbulent periods in Israel's history. The northern kingdom of Israel fell to Assyria in 722 BC. Judah survived, but only barely, and the shadow of Babylon was already growing on the horizon. Into this world of political crisis, military threat and deep spiritual failure, Isaiah spoke. He called God's people to repentance, warned of the consequences of persistent unfaithfulness and proclaimed with extraordinary boldness the purposes of a God who would not ultimately be thwarted.

The book divides broadly into two major sections. The first, covering chapters 1 to 39, focuses largely on judgement and warning, though with sustained promises of a coming deliverer and a renewed people. The second section, chapters 40 to 66, opens with the magnificent Comfort, comfort my people and moves through some of the most glorious passages in all of Scripture: the Servant Songs, the invitation to those who thirst, the promise of a new creation and the vision of a redeemed humanity gathered from every nation under the glory of God.

At the centre of this second section are the four Servant Songs, reaching their climax in chapter 53. Here Isaiah describes with astonishing precision a servant who suffers on behalf of others, who bears their iniquities and by whose wounds they are healed. This passage alone would secure Isaiah's place as one of the most remarkable books ever written.

Isaiah son of Amoz ministered in Jerusalem during the reigns of Uzziah, Jotham, Ahaz and Hezekiah, kings of Judah. This places his ministry approximately in the period 740 to 700 BC, though he may have continued beyond Hezekiah's reign. He is one of the most fully drawn personalities among the prophets, a man of courage, poetic genius and deep theological vision.

The book itself raises questions of authorship that have been discussed by scholars for centuries. The shift in tone, historical setting and theological emphasis between chapters 1 to 39 and chapters 40 to 66 has led many scholars to propose that the latter section was composed by a later author or authors writing in the Isaianic tradition during or after the Babylonian exile. Others hold to the unity of the book under a single author, arguing that Isaiah's prophetic vision reached forward across the centuries to address the situation of exiles not yet born.

The New Testament itself quotes from both sections of Isaiah and attributes them consistently to the same prophet. Jesus reads from Isaiah 61 in the synagogue at Nazareth. Philip finds the Ethiopian official reading Isaiah 53. Whatever one's view of the book's composition, its canonical unity and its towering witness to the purposes of God in salvation remain unchallenged.

Isaiah points to Jesus more directly and more fully than any other Old Testament book. The connections are not incidental. They form the theological backbone of the book's second half.

The child born in Isaiah 9, on whose shoulders the government would rest, whose name would be Wonderful Counsellor, Mighty God, Everlasting Father, Prince of Peace, is Jesus. The shoot from the stump of Jesse in Isaiah 11, on whom the Spirit of the Lord rests, is Jesus. The servant who does not break a bruised reed in Isaiah 42 is Jesus, as Matthew explicitly states. The one who comes to proclaim good news to the poor in Isaiah 61 is Jesus, as He Himself announces in the synagogue at Nazareth.

But it is Isaiah 53 that stands above all. Here the prophet describes a suffering servant who was despised and rejected, who carried our griefs and sorrows, who was wounded for our transgressions and crushed for our iniquities, upon whom the chastisement that brought us peace was laid, and by whose stripes we are healed. Philip uses this very chapter to explain the Gospel to the Ethiopian official. Peter draws on it in his first letter. The apostles return to it again and again because it describes with extraordinary precision what Jesus did on the cross and why He did it.

Isaiah also looks forward to the new creation, the gathering of the nations and the rule of God over all things. The book ends looking ahead to a renewed heaven and earth, a vision that is taken up and fulfilled in Revelation 21 and 22. From first to last, Isaiah is a book about the God who saves and the servant through whom that salvation comes.

"For to us a child is born, to us a son is given, and the government will be on His shoulders. And He will be called Wonderful Counsellor, Mighty God, Everlasting Father, Prince of Peace." — Isaiah 9:6

"Surely He took up our pain and bore our suffering, yet we considered Him punished by God, stricken by Him, and afflicted. But He was pierced for our transgressions, He was crushed for our iniquities; the punishment that brought us peace was on Him, and by His wounds we are healed." — Isaiah 53:4–5

"Come, all you who are thirsty, come to the waters; and you who have no money, come, buy and eat! Come, buy wine and milk without money and without cost." — Isaiah 55:1

God's holiness, humanity's failure and the saving purposes of God that cannot be undone. Isaiah begins with a people who have turned from God and carries them through judgement and exile toward a vision of redemption, restoration and new creation that is wider and more glorious than anything they had imagined.

The name Isaiah means the Lord saves, and that is the book's heartbeat from first to last. Salvation is not something humanity achieves by effort or merit. It is something God accomplishes through His chosen servant, at great cost, for the sake of a people who deserved judgement. The comfort of chapters 40 to 66 is not shallow reassurance. It is the comfort of a God who has dealt with the real problem and opened a real way home.

Isaiah 40 has been read and re-read by believers in every generation of difficulty, and it never loses its power. Comfort, comfort my people, says your God. Speak tenderly to Jerusalem, and proclaim to her that her hard service has been completed, that her sin has been paid for. These are words addressed to people who have been through something devastating and wonder whether God has forgotten them. The answer Isaiah gives is one of the most magnificent in all of Scripture: those who hope in the Lord will renew their strength. They will soar on wings like eagles.

Isaiah 55 extends an extraordinary invitation. Come to the waters. Come without money. Come and buy what you cannot earn. Seek the Lord while He may be found. This invitation is not addressed to the deserving or the spiritually accomplished. It is addressed to the thirsty, the hungry and the one who has been spending money on what does not satisfy. It is as relevant now as it was when it was first written.

For anyone reading the Old Testament and wondering how it connects to Jesus, Isaiah is indispensable. Chapter 53 in particular has a way of stopping readers in their tracks. The servant described there is not a general figure. He is specific, recognisable and unmistakable to anyone who has read the Gospels. Beginning with this passage, as Philip did with the Ethiopian official, the Gospel can be opened clearly and fully. Isaiah is not background material. It is one of the most direct and powerful witnesses to Christ in the entire Bible.