4. The Prophecy was written concerning Judah and Jerusalem. It is a support of faith and hope in Christ.
This Prophecy was indeed written עַל־יְהוּדָ֖ה וִירוּשָׁלִָ֑ם, concerning Judah and Jerusalem, Isaiah 1:1, and so concerning matters to be communicated by Isaiah, the servant of GOD to Judah and Jerusalem: as concerning their sins and unrighteousness, concerning the sense of the law and promise, concerning blessings and judgments, concerning the signs of the times of the coming of the Son of GOD to them, concerning the revelation of the righteousness and Kingdom of Christ among them; concerning the casting out of the Jews, the calling of the Gentiles, judgments against Christ, and all the subsequent glories of the Kingdom of Christ. Which things do indeed pertain to Judah and Jerusalem, that is, because of all the sons of Jacob Judah alone is he, from whom salvation had to proceed, and the Sun of righteousness ἀνατέλλεσθαι, to arise,[1] and the place of the manifestation of Christ was Jerusalem: yet in such a way that it pertains to us also, upon whom the ends of the world are come,[2] since all things that were written were written for our learning, so that we through patience and comfort of the Scriptures might have hope, Romans 15:4. It was necessary that our faith in Christ be most certainly confirmed, whose life and death, righteousness and Kingdom we read to have been clearly foretold so many ages beforehand; and our hope of the future revelation of the glory of Christ, which is also displayed with the greatest lustre in the prophecies of Isaiah.
[1] Malachi 4:2: “But unto you that fear my name shall the Sun of righteousness arise (וְזָרְחָה; καὶ ἀνατελεῖ, in the Septuagint) with healing in his wings; and ye shall go forth, and grow up as calves of the stall.” See also Isaiah 9:2; Matthew 4:16. [2] 1 Corinthians 10:11.
Dr Dilday's Lecture: "Isaiah 53"