Isaiah is the first of the Books of Prophecy and the twenty third book of the Old Testament. It provides prophecies related to the Messiah, Christ and his kingdom.
The Prophet Isaiah was primarily called to prophesy to the Kingdom of Judah. Judah was going through times of revival and times of rebellion. Judah was threatened with destruction by Assyria and Egypt, but was spared because of God’s mercy. Isaiah proclaimed a message of repentance from sin and hopeful expectation of God’s deliverance in the future.
The Book of Isaiah reveals God’s judgment and salvation. God is “holy, holy, holy” (Isaiah 6:3), and therefore He cannot allow sin to go unpunished (Isaiah 1:2; 2:11-20; 5:30; 34:1-2; 42:25). Isaiah portrays God’s oncoming judgment as a “consuming fire” (Isaiah 1:31; 30:33).
At the same time, Isaiah understands that God is a God of mercy, grace, and compassion (Isaiah 5:25; 11:16; 14:1-2; 32:2; 40:3; 41:14-16). The nation of Israel (both Judah and Israel) is blind and deaf to God’s commands (Isaiah 6:9-10; 42:7). Judah is compared to a vineyard that should be, and will be, trampled on (Isaiah 5:1-7). Only because of His mercy and His promises to Israel, will God not allow Israel or Judah to be completely destroyed. He will bring restoration, forgiveness, and healing (43:2; 43:16-19; 52:10-12).
More than any other book in the Old Testament, Isaiah focuses on the salvation that will come through the Messiah. The Messiah will one day rule in justice and righteousness (Isaiah 9:7; 32:1). The reign of the Messiah will bring peace and safety to Israel (Isaiah 11:6-9). Through the Messiah, Israel will be a light to all the nations (Isaiah 42:6; 55:4-5). The Messiah’s kingdom on earth (Isaiah chapter 65-66) is the goal towards which all of the Book of Isaiah points. It is during the reign of the Messiah that God’s righteousness will be fully revealed to the world.
In a seeming paradox, this book also presents the Messiah as one who will suffer. Isaiah chapter 53 vividly describes the Messiah suffering for sin. It is through His wounds that healing is achieved. It is through His suffering that our iniquities are taken away. This apparent contradiction is solved in the Person of Jesus Christ. In His first advent, Jesus was the suffering servant of Isaiah chapter 53. In His second advent, Jesus will be the conquering and ruling King, the Prince of Peace (Isaiah 9:6).
(Note: Description used with permission from www.gotquestions.org)