Isaiah 52-57 (The Daily Walk Bible).
Romans 10:14-15 uses a quote from Isaiah 52 to show the importance of preaching the gospel: “How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? And how are they to preach unless they are sent? As it is written, ‘How beautiful are the feet of those who preach the good news!’”
Isaiah 53. Just wow. https://youtu.be/2Aq9KISzaAo
Isaiah 55 reminds us that salvation is free and is the only thing that really satisfies, and Isaiah 56 reminds us that salvation is for all (“I will also bless the Gentiles”).