For example, the oneness of the book is indicated by the expression, “the Holy One of Israel,” which appears 12 times in chapters 1 to 39, and 13 times in chapters 40 to 66, a total of 25 times; whereas it appears only 6 times throughout the rest of the Hebrew Scriptures.
... Chapters 13 to 35 contain a series of pronouncements against many nations and a forecast of salvation to be provided by Jehovah.