Keil & Delitzsch, on Esth 8:7

“And king Assuerus answered Esther the queen, and Mardochai the Jew: I have given Aman’s house to Esther, and I have commanded him to be hanged on a gibbet, because he durst lay hands on the Jews.”

“The king could not simply revoke the edict issued by Haman in due legal form, but, ready to perform the request of the queen, he first assures her of his good intentions, reminding her and Mordochai that he has given the house of Haman to Esther and hanged Haman, because he laid hand on the Jews (תּלוּ אתו, him they have executed); and then grants them permission, as he had formerly done to Haman, to send letters to the Jews in the king's name, and sealed with the king's seal, and to write בּעיניכם כּטּוב, "as seems good to you," i.e., to give in writing such orders as might in Esther's and Mordochai's judgment render the edict of Haman harmless. "For," he adds, "what is written in the king's name and sealed with his seal cannot be reversed." This confirmatory clause is added by the king with reference to the law in general, not as speaking of himself objectively as "the king." להשׁיב אין refers to Esther's request: להשׁיב יכּתב (Est 8:5). ונחתּום, infin. abs. used instead of the perfect.”

Imported from an open dataset — not yet checked against the printed edition.