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Easton's Bible Dictionary
The author of this book was no doubt Nehemiah himself. There are portions of the book written in the first person (ch. 1-7; 12:27-47, and 13). But there are also portions of it in which Nehemiah is spoken of in the third person (ch. 8; 9; 10). It is supposed that these portions may have been written by Ezra; of this, however, there is no distinct evidence. These portions had their place assigned them in the book, there can be no doubt, by Nehemiah. He was the responsible author of the whole book, with the exception of ch 12:11,22,23.
The date at which the book was written was probably about B.C. 431-430, when Nehemiah had returned the second time to Jerusalem after his visit to Persia.
The book, which may historically be regarded as a continuation of the book of Ezra, consists of four parts. An account of the rebuilding of the wall of Jerusalem, and of the register Nehemiah had found of those who had returned from Babylon (ch. 1-7). An account of the state of religion among the Jews during this time (8-10). Increase of the inhabitants of Jerusalem; the census of the adult male population, and names of the chiefs, together with lists of priests and Levites ((11-12:1-26).). Dedication of the wall of Jerusalem, the arrangement of the temple officers, and the reforms carried out by Nehemiah Nehemiah 13 ).
This book closes the history of the Old Testament. Malachi the prophet was contemporary with Nehemiah.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Nehemiah, Book of'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/n/nehemiah-book-of.html. 1897.