Who was the prophet Isaiah?

Understanding Isaiah 6:8, Isaiah 7:14, Isaiah 53:5

Isaiah son of Amoz is widely regarded as the greatest of the Old Testament prophets. His book is the longest prophetic work in the Bible (66 chapters), his influence on the New Testament is unmatched by any other prophet, and his messianic prophecies are so detailed that early church fathers called him 'the Fifth Evangelist' — a gospel writer before the Gospels existed.

Historical context

Isaiah prophesied in Jerusalem during the reigns of four kings of Judah: Uzziah, Jotham, Ahaz, and Hezekiah (Isaiah 1:1) — a period spanning approximately 740-681 BC. This was a time of profound political crisis. The Assyrian Empire under Tiglath-Pileser III, Shalmaneser V, Sargon II, and Sennacherib was expanding relentlessly, swallowing nations across the ancient Near East. The northern kingdom of Israel fell to Assyria in 722 BC. Judah survived — barely — thanks in part to Isaiah's counsel.

Isaiah was not a rural prophet crying from the wilderness. He had access to kings, moved in court circles, and was likely of noble or royal birth (Jewish tradition held he was a cousin of King Uzziah). He was married to a woman called 'the prophetess' (8:3), and had at least two sons whose names were prophetic signs: Shear-Jashub ('a remnant shall return,' 7:3) and Maher-Shalal-Hash-Baz ('quick to the plunder, swift to the spoil,' 8:1-4).

The call (Isaiah 6)

Isaiah's call to ministry came 'in the year that King Uzziah died' (6:1) — approximately 740 BC. He saw a vision of the Lord 'seated on a throne, high and exalted, and the train of his robe filled the temple' (6:1). Seraphim (angelic beings with six wings) called out: 'Holy, holy, holy is the Lord Almighty; the whole earth is full of his glory' (6:3). The triple repetition — the only attribute of God repeated three times in the Bible — emphasizes holiness as God's defining characteristic.

Isaiah's response was immediate terror: 'Woe to me! I am ruined! For I am a man of unclean lips, and I live among a people of unclean lips, and my eyes have seen the King, the Lord Almighty' (6:5). A seraphim touched his lips with a live coal from the altar: 'See, this has touched your lips; your guilt is taken away and your sin atoned for' (6:7).

Then came the commission: 'Whom shall I send? And who will go for us?' Isaiah's answer — 'Here am I. Send me!' (6:8) — is one of the most famous responses in Scripture. But the assignment was grim: 'Go and tell this people: "Be ever hearing, but never understanding; be ever seeing, but never perceiving." Make the heart of this people calloused; make their ears dull and close their eyes' (6:9-10). Isaiah was told his preaching would not produce repentance — at least not among the majority. Jesus quoted this passage to explain why many rejected His own teaching (Matthew 13:14-15).

Isaiah's ministry

The Syro-Ephraimite crisis (Isaiah 7): When Syria and the northern kingdom of Israel allied against Judah, King Ahaz panicked. Isaiah met him and offered a sign from God — any sign. Ahaz piously refused ('I will not test the Lord,' 7:12). Isaiah responded with one of the Bible's most famous prophecies: 'Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel' (7:14). In its immediate context, this referred to a child whose birth would signal deliverance from the immediate threat. Matthew 1:22-23 identified its ultimate fulfillment in Jesus Christ — 'God with us.'

The Assyrian crisis (Isaiah 36-37): When Sennacherib's army surrounded Jerusalem in 701 BC, King Hezekiah turned to Isaiah. The prophet declared: 'This is what the Lord says concerning the king of Assyria: He will not enter this city or shoot an arrow here... I will defend this city and save it, for my sake and for the sake of David my servant' (37:33-35). That night, 'the angel of the Lord went out and put to death 185,000 in the Assyrian camp' (37:36). Sennacherib withdrew and was later assassinated by his own sons.

The book's structure

Isaiah is often described as a 'Bible in miniature' — 66 chapters, divided into two major sections, just as the Bible has 66 books divided into Old and New Testaments:

Chapters 1-39: Judgment. Warnings against Judah, Jerusalem, and the nations. Oracles against Babylon, Moab, Damascus, Egypt, Tyre, and others. Woe oracles against those who oppress the poor, get drunk, call evil good, and trust in military alliances rather than God. But even within the judgment section, there are brilliant flashes of hope — the messianic prophecies of chapters 7, 9, and 11.

Chapters 40-66: Comfort. 'Comfort, comfort my people, says your God' (40:1) opens a dramatic shift in tone. These chapters look beyond judgment to restoration, redemption, and ultimate hope. They contain the Servant Songs, the vision of a new heaven and new earth, and some of the most beautiful poetry in all of Scripture.

The messianic prophecies

Isaiah contains more detailed prophecies about the Messiah than any other Old Testament book:

• Born of a virgin: 'The virgin will conceive and give birth to a son, and will call him Immanuel' (7:14 → Matthew 1:22-23)
• A great light in Galilee: 'The people walking in darkness have seen a great light; on those living in the land of deep darkness a light has dawned' (9:2 → Matthew 4:15-16)
• Titles of the Messiah: '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 Counselor, Mighty God, Everlasting Father, Prince of Peace' (9:6)
• From Jesse's line: 'A shoot will come up from the stump of Jesse; from his roots a Branch will bear fruit' (11:1)
• Anointed to preach good news: 'The Spirit of the Sovereign Lord is on me, because the Lord has anointed me to proclaim good news to the poor' (61:1 → Luke 4:18-21, where Jesus read this passage in the Nazareth synagogue and said: 'Today this scripture is fulfilled in your hearing')

The Suffering Servant (Isaiah 52:13-53:12)

This passage — the fourth and greatest of the 'Servant Songs' (42:1-9, 49:1-7, 50:4-9, 52:13-53:12) — is the most remarkable prophecy in the Old Testament. Written approximately 700 years before Christ, it describes with extraordinary precision the suffering, death, and significance of Jesus:

'He was despised and rejected by mankind, a man of suffering, and familiar with pain' (53:3). 'Surely he took up our pain and bore our suffering, yet we considered him punished by God, stricken by him, and afflicted' (53:4). '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' (53:5). 'We all, like sheep, have gone astray, each of us has turned to our own way; and the Lord has laid on him the iniquity of us all' (53:6). 'He was oppressed and afflicted, yet he did not open his mouth; he was led like a lamb to the slaughter' (53:7). 'He was assigned a grave with the wicked, and with the rich in his death' (53:9 — Jesus was crucified between criminals and buried in a rich man's tomb). 'After he has suffered, he will see the light of life and be satisfied; by his knowledge my righteous servant will justify many, and he will bear their iniquities' (53:11).

When the Ethiopian eunuch in Acts 8 was reading Isaiah 53 and asked Philip, 'Who is the prophet talking about?' — Philip 'began with that very passage of Scripture and told him the good news about Jesus' (Acts 8:35). The passage is virtually a narrative of the crucifixion written seven centuries in advance.

Isaiah's legacy

Isaiah is quoted or alluded to more than 400 times in the New Testament — more than any other Old Testament book. John the Baptist's identity was defined by Isaiah: 'A voice of one calling: "In the wilderness prepare the way for the Lord"' (40:3 → Matthew 3:3). Jesus launched His public ministry by reading Isaiah (Luke 4:16-21). Paul's theology of salvation drew heavily on Isaiah. The Book of Revelation is saturated with Isaianic imagery — the new heaven and new earth (Isaiah 65:17 → Revelation 21:1), God wiping away every tear (Isaiah 25:8 → Revelation 21:4).

Isaiah's death

The Bible does not record Isaiah's death. Jewish tradition (preserved in the pseudepigraphal text The Ascension of Isaiah and referenced by early church fathers including Justin Martyr and Origen) holds that Isaiah was martyred during the reign of the wicked King Manasseh — sawn in half inside a hollow log. Many scholars believe Hebrews 11:37 ('they were sawed in two') alludes to Isaiah's death.

Why Isaiah matters

Isaiah is the prophet who saw it all: God's holiness and humanity's sin, judgment and mercy, exile and return, the suffering Messiah and the reigning King, the destruction of nations and the renewal of creation. His vision stretched from the immediate crisis of Assyrian invasion to the ultimate future where 'the wolf will live with the lamb' (11:6) and 'the earth will be filled with the knowledge of the Lord as the waters cover the sea' (11:9). To read Isaiah is to encounter the full range of God's character — terrifying in holiness, relentless in justice, inexhaustible in mercy, and working through all of human history toward a redemption far greater than anyone dared imagine.