Esther 9:23-32

Thus the Jews undertook what they had started to do, and what Mordecai had written to them. For Haman the son of Hammedatha, the Agagite, the adversary of all the Jews, had schemed against the Jews to destroy them and had cast Pur, that is the lot, to disturb them and destroy them. But when it came to the king’s attention, he commanded by letter that his wicked scheme which he had devised against the Jews, should return on his own head and that he and his sons should be hanged on the gallows. Therefore they called these days Purim after the name of Pur. And because of the instructions in this letter, both what they had seen in this regard and what had happened to them, the Jews established and made a custom for themselves and for their descendants and for all those who allied themselves with them, so that they would not fail to celebrate these two days according to their regulation and according to their appointed time annually. So these days were to be remembered and celebrated throughout every generation, every family, every province and every city; and these days of Purim were not to fail from among the Jews, or their memory fade from their descendants. Then Queen Esther, daughter of Abihail, with Mordecai the Jew, wrote with full authority to confirm this second letter about Purim. He sent letters to all the Jews, to the 127 provinces of the kingdom of Ahasuerus, namely, words of peace and truth, to establish these days of Purim at their appointed times, just as Mordecai the Jew and Queen Esther had established for them, and just as they had established for themselves and for their descendants with instructions for their times of fasting and their lamentations. The command of Esther established these customs for Purim, and it was written in the book.