Esther 9:30-31

30He sent letters to all the Jews, 1to the 127 provinces of the kingdom of Ahasuerus, namely, words of peace and truth,

31to 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 2descendants, with 3instructions 4for their times of fasting and their mourning.