The first recorded sermon of the Lord Jesus was not from Genesis or Psalms, but instead the prophet Isaiah. Isaiah is the most quoted OT prophet in the NT. To summarize an outline of the book we may divided it into three parts: Prophetic, to Israel and Gentile nations, especially Assyria (1–35); Historic, relating to the reign of Hezekiah (36–39); Messianic, especially regarding the deliverance of a remnant in Israel (40–66). As was the manner of the prophets, Isaiah preached required righteousness and redemption for those who failed.