Now that which was prepared for me daily was one ox and six choice sheep; also fowls were prepared for me, and once in ten days store of {n} all sorts of wine: yet for all this required not I the bread of the governor, because the bondage was heavy upon this people.

(n) While at other times they had by measure, at this time they had most liberally.Nehemiah 5:18 Parallel Commentaries

Influences that Gave Rise to the Priestly Laws and Histories
[Sidenote: Influences in the exile that produced written ceremonial laws] The Babylonian exile gave a great opportunity and incentive to the further development of written law. While the temple stood, the ceremonial rites and customs received constant illustration, and were transmitted directly from father to son in the priestly families. Hence, there was little need of writing them down. But when most of the priests were carried captive to Babylonia, as in 597 B.C., and ten years later the temple …
Charles Foster Kent—The Origin & Permanent Value of the Old Testament

Ezra-Nehemiah
Some of the most complicated problems in Hebrew history as well as in the literary criticism of the Old Testament gather about the books of Ezra and Nehemiah. Apart from these books, all that we know of the origin and early history of Judaism is inferential. They are our only historical sources for that period; and if in them we have, as we seem to have, authentic memoirs, fragmentary though they be, written by the two men who, more than any other, gave permanent shape and direction to Judaism, then …
John Edgar McFadyen—Introduction to the Old Testament