The words that start Nehemiah 1:1, "The words of Nehemiah son of Hacaliah", shows that Ezra and Nehemiah were at first two different works. However, they were put together as one in the earliest Hebrew manuscripts. Josephus and the Jewish Talmud talk about the book of Ezra but not a different book of Nehemiah. The oldest manuscripts of the Septuagint also treat Ezra and Nehemiah as one book.