Esther 9:18-23

But the Jews who were in Susa assembled on the thirteenth and on the fourteenth of the same month, and on the fifteenth day they rested and made it a day of feasting and rejoicing. Therefore the Jews of the villages, who live in the rural [unwalled] towns, make the fourteenth day of the month of Adar a holiday for rejoicing and feasting and sending choice portions of food to one another. Now Mordecai recorded these events, and he sent letters to all the Jews who lived in all the provinces of King Ahasuerus, both near and far, obliging them to celebrate the fourteenth day of the month of Adar, and the fifteenth day of the same month, annually, because on those days the Jews rid themselves of their enemies, and as the month which was turned for them from grief to joy and from mourning into a holiday; that they should make them days of feasting and rejoicing and sending choice portions of food to one another and gifts to the poor. So the Jews undertook what they had started to do, and what Mordecai had written to them.