Jamieson, Fausset and Brown on Ezra 7:11

Ezr 7:11-26. Gracious Commission of Artaxerxes.

11. this is the copy of the letter that the king Artaxerxes gave--The measure which this document authorized, and the remarkable interest in the Jews displayed in it, were most probably owing to the influence of Esther, who is thought to have been raised to the high position of queen a few months previous to the departure of Ezra [Hales]. According to others, who adopt a different chronology, it was more probably pressed upon the attention of the Persian court by Ezra, who, like Daniel, showed the prophecies to the king; or by some leading Jews on his accession, who, seeing the unsettled and disordered state of the colony after the deaths of Zerubbabel, Jeshua, Haggai, and Zechariah, recommended the appointment of a commission to reform abuses, suppress disorder, and enforce the observance of the law.