Much of the first thirty-nine chapters of the book of Isaiah are a contrast between two of Judah’s Kings: Ahaz (Isaiah 7-14; 2 Kings 16; 2 Chronicles 28) and Hezekiah (Isaiah 13-39; 2 Kings 18-20; 2 Chronicles 29-32). Isaiah exhorted the former to trust in the Lord and ask for a sign of deliverance from the Assyrian King, Tiglath-pileser (Isa 7:10-19; 2 Kgs 16:1-14). Ahaz rejected Isaiah’s message—and because he chose not to stand firm in his faith, he did not stand at all. Since the day of Ahaz’s disastrous decision, Isaiah had exhorted Judah to avoid any alliance with a foreign power and instead cast all of their expectations on the Lord—who alone could deliver them from the Assyrian siege. The drama of the narrative is thick; what would Hezekiah do?
King Sennacherib sent the Rabshakeh to intimidate Hezekiah in the by-then-surrounded city of Jerusalem (Isaiah 36). The Rabshakeh warned Hezekiah of trusting in Egypt and tried to persuade him against trusting in the Lord. The Assyrian leader was a man of political skill; why not just surrender to the Assyrian forces, he suggested, according to God’s will (Isa 36:8-10)? He taunted the people of Jerusalem, bidding them to do anything but trust the Lord—since no other god had been able to deliver its people from the mighty Assyrian forces (Isa 36:13-20).
“When King Hezekiah heard their report,” Isaiah noted, “he tore his clothes, put on sackcloth, and went to the house of the LORD” (Isa 37:1). Hezekiah sent an envoy to Isaiah, informing the prophet of the Rabshakeh’s boasts and asking him to intercede for the survival of the remnant. Judah’s king was a political leader with few political options left to his disposal; if Jerusalem were to be delivered, it would be by the grace of the Lord alone. Isaiah replied to the king with the word of the Lord, “Don’t be afraid because of the words you have heard, which the king of Assyria’s attendants have blasphemed Me with. Look! I am putting a spirit in him and he will hear a rumor and return to his own land, where I will cause him to fall by the sword” (Isa 37:6-7).
And it came about just as Isaiah prophesied. In light of a sudden threat from the king of Egypt, Sennacherib had to adjust his military strategy and pull back from Jerusalem (Isa 37:8-9a). Sennacherib did in fact go back the way he came (Isa 37:29, 34), after he saw 185,000 of the Assyrian warriors fallen from the angel of the Lord (Isa 37:36-37). While Hezekiah continued to trust in the Lord when he was terminally ill—and received a sign that his life would be prolonged fifteen years (Isaiah 38; 2 Kgs 20:1-11; 2 Chron 32:24-26)—he showed contempt for his God by allowing the Babylonian envoy to investigate the treasures of his house (Isaiah 39; 2 Kgs 20:12-19).
In Isaiah 10-35, the prophet urged Judah and her leaders to rely wholly on the Lord during the crisis in the north. The Lord’s answer to Hezekiah’s prayer (Isa 37:21-35) provides a point of synthesis for Isaiah 1-39 and proves informative for the storyline of Scripture. The Lord’s motive for rescuing Judah was that He had a plan to redeem a people for His glory. “This is the LORD’s declaration,” Isaiah proclaimed, “I will defend this city and rescue it, because of Me and because of My servant David” (Isa 37:35). But this deliverance was temporary. Because of Hezekiah’s folly before the envoy from Babylon and Judah’s continual idolatrous practices, within two generations Nebuchadnezzar marched into Jerusalem and destroyed the city (2 Kgs 25:1-21; 2 Chron 36:15-21). Hezekiah and Jerusalem would be rescued from Assyria, but not from the Lord. As the prophet had predicted, the Lord would raise up a nation to discipline His people for their idolatrous ways (Isa 29:1-10). In the flow of redemptive history, it becomes clear that the ultimate significance of the city of David rests upon David’s greater son, Jesus Christ. In Christ, Jerusalem has an eternal significance. The author of Hebrews described Jerusalem as the heavenly abode where the followers of Jesus assemble with Him and the angels in a festive gathering (Heb 12:22-24). There, John wrote, God’s people will be in the Lord’s presence forever (Revelation 21).

Isaiah 40-48
While positioning the exact temporal reference of Isaiah 40-66 is difficult, the theological vision these chapters establish is easily discerned. Here God further showed His jealousy for Israel’s trust, employing polemics to arouse Judah to grasp both His superiority over the idols of the nations and His plan of redemption. Isaiah announced the Lord’s call for Israel to be His servant while they awaited the true Servant of the Lord—the One who would rule over them as the Messiah. While the prophecies of the latter portion of Isaiah had an initial situation in mind, many of the individual predictions are substantive for the storyline of Scripture.
(1) The Lord would send one to prepare the way for His Servant. In Isa 40:3-5, the prophet spoke of one who would prepare the way for the Lord. The Gospel writers spoke in concert that Isaiah was foretelling John the Baptist (Matt 3:3//Mark 1:3//Luke 3:4-6//John 1:23). The framework of John’s messages expressed Isaiah’s topographical references. Valleys, mountains, uneven ground, and rough places would all change, Isaiah said (Isa 40:4). John called his listeners to repent of self-centered religion, to share, resist opportunities for extortion, and go the extra mile (Luke 3:10-14).
(2) The Lord’s Servant would establish justice by performing acts of mercy. In Isa 42:1-4, Isaiah prophesied that the coming Servant of the Lord would be filled with the Spirit and establish justice. In the near term, Cyrus King of Persia was the Lord’s instrument, releasing the captives and allowing them to return and rebuild Jerusalem (Isa 44:24-28; Ezra 1:1-4). But the prophet’s description of the Lord’s Servant goes beyond Cyrus. Matthew saw in Jesus’ ministry in Galilee the kinds of activities that Isaiah wrote about in Isa 42:1-4. Large crowds followed Jesus and Jesus’ merciful acts to the lame, diseased, and tormented among them (Matt 12:15-21) were the fulfillment of Isaiah’s statement that the Lord’s Servant would mercifully right the wrongs plaguing humanity.
(3) The Lord’s Servant would lead a unified people. Both Peter and Paul understood some of Isaiah’s phrases as a basis for calling believers to pursue fellowship in the church. Paul used Isa 45:23 (“Every knee will bow to Me, every tongue will swear allegiance.”) to describe Jesus Christ’s ultimate glory—which resulted from His humble incarnation and crucifixion (Phil 2:10-11). Paul’s injunction to the Philippians was that each should “look out not only for his own interests, but also for the interests of others” (Phil 2:4)—as Christ did in coming to earth and suffering and dying—after which He was exalted to receive the homage Isaiah predicted. Peter quoted Isa 40:6b-8 (“All humanity is grass, and all its goodness is like the flower of the field. The grass withers, the flowers fade when the breath of the LORD blows on them; indeed, the people are grass. The grass withers, the flowers fade, but the word of our God remains forever.”) to justify the enduring power of the word of God unto regeneration (1 Pet 1:23-25). In Peter’s mind, Isaiah’s phrase was not merely a matter of doctrinal recitation but was the basis for his command for believers to love one another with devotion and purity (1 Pet 1:22).
(4) The Lord would redeem His people by destroying their opponents—quickly. The Lord had chosen Babylon as an instrument to discipline His people and promised to execute justice against them (Isaiah 47-48). Babylon was a lover of luxury, Isaiah said, thinking herself secure. But the Babylonians would suddenly be destroyed, like the one enduring the loss of children and spouse in the same day (Isa 47:8-9). John took up Isaiah’s portrayal of the downfall of Babylon writing that Babylon’s supposed self-security was paper-thin. In a single day, the Lord would destroy fortified Babylon (Rev 18:7-8).
Commentary Isaiah Major Prophets Old Testament