Esther 9:23-32

So 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 enemy of all the Jews, had plotted against the Jews to destroy them and had cast Pur, that is, the lot, [to find the right time] to disturb and destroy them. But when it came before the king, he commanded in writing that Haman’s wicked scheme which he had devised against the Jews was to return on his own head, and that he and his sons should [endure what he planned for the Jews and] be hanged on the gallows. Therefore they called these days Purim after the name Pur (lot). And because of all the instructions in this letter, and what they had faced in this regard and what had happened to them, the Jews established and made it a custom for themselves and for their descendants and for all who joined them, so that they would not fail to celebrate these two days as it was written and at the 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 cease from among the Jews, nor their memory fade from their descendants. Then Queen Esther, the daughter of Abihail, with Mordecai the Jew, wrote with full power and authority to confirm this second letter about Purim. He sent letters to all the Jews, to the 127 provinces of the kingdom of Ahasuerus, in words of peace and truth, to establish these days of Purim [to be observed] at their appointed times, just as Mordecai the Jew and Queen Esther had established for them, and as they had established for themselves and for their descendants with instructions regarding their times of fasting and their lamentations (expressions of needing help). The command of Esther established these customs for Purim, and it was written in the book [of the royal archives].