Esther 8:7-8

Then King Ahasuerus said to Queen Esther and to Mordecai the Jew, “Behold, I have given Esther the house of Haman, and they have hanged him on the gallows because he stretched out his hand against the Jews. Also, concerning the Jews, write as you see fit, in the king’s name, and seal it with the king’s signet ring—for a decree which is written in the king’s name and sealed with the king’s signet ring may not be revoked.”