For ten points, identify this book of the Old Testament foretelling the glory of Zion and written by a prophet who was later sawed in half.
This book's fortieth chapter provided the aria "O thou that tellest good tidings to Zion." That chapter begins with a description of a road from Persia and prophesies that "every valley shall be exalted, and every mountain and hill made low" in order to build it. This scripture's second part is sometimes called the "Book of Comfort;" its first part prophesies that the nations persecuting Judah will be defeated, but also warns the people that they have broken the covenant of God by worshipping idols. For ten points, identify this book of the Old Testament foretelling the glory of Zion and written by a prophet who was later sawed in half.
This book's fortieth chapter provided the aria "O thou that tellest good tidings to Zion."
The Book of {Isaiah}