Esther 9:24-32

24For Haman son of Hammedatha, the Agagite, the enemy of all the Jews, had plotted against the Jews to destroy them and had cast the Pur (that is, the lot) to crush and destroy them. 25But when it came before the king, he commanded by letter that the wicked scheme which Haman had devised against the Jews should come back upon his own head, and that he and his sons should be hanged on the gallows.

26Therefore these days are called Purim, from the word Pur.

Because of all the instructions in this letter, and because of all they had seen and experienced, 27the Jews bound themselves to establish the custom that they and their descendants and all who join them should not fail to celebrate these two days at the appointed time each and every year, according to their regulation. 28These days should be remembered and celebrated by every generation, family, province, and city, so that these days of Purim should not fail to be observed among the Jews, nor should the memory of them fade from their descendants.

29So Queen Esther daughter of Abihail, along with Mordecai the Jew, wrote with full authority to confirm this second letter concerning Purim. 30And Mordecai sent letters with words of peace and truth to all the Jews in the 127 provinces of the kingdom of Xerxes, 31in order to confirm these days of Purim at their appointed time, just as Mordecai the Jew and Queen Esther had established them and had committed themselves and their descendants to the times of fasting and lamentation.

32So Esther’s decree confirmed these regulations about Purim, which were written into the record.