Esther 9:26 That is why the holidays are called Purim. Because of Mordecai's letter and because of all that had happened to them,Esther 9:21 telling them to observe the fourteenth and fifteenth days of Adar as holidays every year.
Greek Esther E:34  “Include this day among your national holidays and celebrate it as a festival. Greek Esther 9:21  telling them to observe the fourteenth and fifteenth days of Adar as holidays.
Sirach (Ecclesiasticus) 33:8 It is because the Lord made them different by setting them apart as religious holidays and festivals.
Greek Esther 9:19  This is why Jews who live in small towns observe the fourteenth day of the month of Adar as a holiday, while the Jews in the large cities celebrate the holiday in the same way on the fifteenth.
Esther 9:18 The Jews of Susa, however, made the fifteenth a holiday, since they had slaughtered their enemies on the thirteenth and fourteenth and then stopped on the fifteenth. Greek Esther 9:17  On the next day, the fourteenth, there was no more killing, and the Jews made it a joyful holiday of rest and feasting.
Greek Esther 9:18  The Jews of Susa, however, made the fifteenth a holiday, since they had slaughtered their enemies on the thirteenth and fourteenth and did not stop until the fifteenth. Esther 8:17 In every city and province, wherever the king's proclamation was read, the Jews held a joyful holiday with feasting and happiness.
In fact, many other people became Jews, because they were afraid of them now. Esther 9:19This is why Jews who live in small towns observe the fourteenth day of the month of Adar as a joyous holiday, a time for feasting and giving gifts of food to one another.
Esther 2:18 Then the king gave a great banquet in Esther's honour and invited all his officials and administrators. He proclaimed a holiday for the whole empire and distributed gifts worthy of a king.
Judith 8:6 She fasted during that entire period except when fasting was forbidden: the day before the Sabbath and the Sabbath itself, the eve of the New Moon Festival and the Festival itself, and all the festivals and holidays observed by the people of Israel.
Greek Esther 8:41  They held a joyful holiday with feasting and happiness in every city and province, wherever the king's proclamation was posted. In fact, many Gentiles were circumcised and became Jews, because they were now afraid of them.
Greek Esther 9:22  These were the days on which the Jews had rid themselves of their enemies. The Jews were to observe the whole month as a holiday, for this was a month that had been turned from a time of grief and despair into a time of joy and happiness.
They were told to observe these days with feasts and parties, giving gifts of food to friends and to the poor.
Greek Esther 9:26-28 [26–28] Because of Mordecai's letter, because of all they had suffered, and because of all that had happened to them, the Jews accepted Mordecai's suggestion and made it a rule for themselves, their descendants, and anyone that might become a Jew, that these days should be properly observed as a memorial, generation after generation, in every city, province, and country.
The Jews were to remember and observe these days of Purim for all time to come and never neglect them. (The holidays are called Purim because “purim” in their language is the word for “lots.”)