Authorship

Moses is the main author of the book of Deuteronomy, It is obvious that he didn't write the account of his own death, Joshua most likely wrote this.This is known as Mosaic authorship
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Deuteronomy is said to be dated in the time of King Josiah of Judah 640-609 __B.C.__ Prior to this time In 622 B.C there was a book of law found in a temple and many associate this book with the book of Deuteronomy.
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