To being possibly the books of Samuel and Kings and some of the Prophets, a part of the Psalter, and documents such as those excerpted in the book of Ezra, respecting edicts issued by Persian kings in favour of the Temple.
The books of Ezra and Nehemiah are of similar structure; here the sources excerpted are the Memoirs of Ezra.
Most probably the second group was excerpted by the editor of chaps.
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