There are two major sections in the book of Isaiah, and two narratives that tell us what the book is about. Chapters 1-39 were in the context of the Assyrian judgment. Hezekiah was the king during the attack and turned to the Lord for help. The Lord then rescues them. Hezekiah later sins and the Lord sends Isaiah to foretell Babylonian judgment. The second half of the book has much stronger themes of the Messiah.
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