The Book of Isaiah is a collection of writings that comprise one of the major prophetic books of the Bible. It is often referred to as the "Prophet Isaiah" or simply "Isaiah". Other synonyms for the Book of Isaiah include the "Book of the Prophet Isaiah" and the "Isaiah Scroll". Additionally, the book is split up into three distinct parts, each with its own set of themes and messages: First Isaiah, Second Isaiah, and Third Isaiah. Some may also refer to the book as part of the "Major Prophets", which includes Jeremiah, Ezekiel, and Daniel, or as a part of the "Old Testament".