Esther 9:28-32

that these days should be remembered and kept throughout every generation, every family, every province, and every city, that these days of Purim should not fail to be observed among the Jews, and that the memory of them should not perish among their descendants. Then Queen Esther, the daughter of Abihail, with Mordecai the Jew, wrote with full authority to confirm this second letter about Purim. And Mordecai sent letters to all the Jews, to the one hundred and twenty-seven provinces of the kingdom of Ahasuerus, with words of peace and truth, to confirm these days of Purim at their appointed time, as Mordecai the Jew and Queen Esther had prescribed for them, and as they had decreed for themselves and their descendants concerning matters of their fasting and lamenting. So the decree of Esther confirmed these matters of Purim, and it was written in the book.