What does Isaiah 37:26 mean?
ESV: "‘Have you not heard that I determined it long ago? I planned from days of old what now I bring to pass, that you should make fortified cities crash into heaps of ruins,
NIV: "Have you not heard? Long ago I ordained it. In days of old I planned it; now I have brought it to pass, that you have turned fortified cities into piles of stone.
NASB: Have you not heard? Long ago I did it, From ancient times I planned it. Now I have brought it about That you would turn fortified cities into ruined heaps.
CSB: Have you not heard? I designed it long ago; I planned it in days gone by. I have now brought it to pass, and you have crushed fortified cities into piles of rubble.
NLT: 'But have you not heard? I decided this long ago. Long ago I planned it, and now I am making it happen. I planned for you to crush fortified cities into heaps of rubble.
KJV: Hast thou not heard long ago, how I have done it; and of ancient times, that I have formed it? now have I brought it to pass, that thou shouldest be to lay waste defenced cities into ruinous heaps.
NKJV: “Did you not hear long ago How I made it, From ancient times that I formed it? Now I have brought it to pass, That you should be For crushing fortified cities into heaps of ruins.
Verse Commentary:
The Lord is reflecting Sennacherib's self-glorifying boasting back to him. The Assyrian king sees himself as unstoppable and invincible (Isaiah 37:22–25). Here, God reveals how incredibly foolish Sennacherib is. The very accomplishments he brags about are part of God's plan. None of those things happened apart from the Lord's influence. The question here is sarcastic: "don't you know?"

God planned to use Assyria as part of His work in judging both Israel and the other nations of earth. The Lord ordained Assyrian conquest. What Sennacherib takes credit for is not the result of his own greatness, but the sovereignty of the Creator (Daniel 4:17; Isaiah 46:8–11. The king of Assyria is trying to take glory that rightfully belongs to the Lord alone.

Yet God's plan also includes punishing the very nations He uses for His purposes. That includes Assyria (Isaiah 10:5–19; 37:36–38).
Verse Context:
Isaiah 37:21–38 contains the Lord's response to Hezekiah's humble prayer (Isaiah 37:14–20). Through Isaiah, the Lord first addresses Sennacherib in a poem. He tells the most powerful man on earth at the time that God will turn him around and send him home. Next the Lord promises Hezekiah that Sennacherib will never even approach Jerusalem, let alone attack it. The remnant of Judah will survive and thrive. As the Assyrians plan to engage in a different battle, the Lord destroys nearly the entire army in a single night. Sennacherib goes home. He is later killed by his sons.
Chapter Summary:
Hezekiah is overcome with grief at news that Sennacherib has mocked the Lord and is coming to destroy Jerusalem. God reassures Hezekiah that the Asyrian king will return home to be killed there. Hezekiah prays in the temple, asking the Lord to defend His name and save Judah. Through Isaiah, the Lord reveals to Hezekiah that Jerusalem will not be touched. Assyria's army won't even have the chance to attack. Responding to their aggression and blasphemy, the "angel of the Lord" virtually wipes out the gigantic Assyrian army overnight. Sennacherib returns home and is later killed by his sons.
Chapter Context:
Isaiah 37 continues the narrative started in Isaiah 36. Assyrian messengers threaten to bring their enormous, nearby army to take Jerusalem. Hezekiah seeks God in response and is reassured that Jerusalem will not see so much as a single Assyrian arrow. The Lord promises to save the city and make the survivors prosper. The angel of the Lord kills an overwhelming number of Assyrian soldiers overnight. Sennacherib returns home and is eventually killed by his own sons. Hezekiah will then face a serious illness and be granted a brief reprieve by God (Isaiah 38).
Book Summary:
Isaiah is among the most important prophetic books in the entire Bible. The first segment details God's impending judgment against ancient peoples for sin and idolatry (Isaiah 1—35). The second part of Isaiah briefly explains a failed assault on Jerusalem during the rule of Hezekiah (Isaiah 36—39). The final chapters predict Israel's rescue from Babylonian captivity (Isaiah 40—48), the promised Messiah (Isaiah 49—57), and the final glory of Jerusalem and God's people (Isaiah 58—66).
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