Esth 9:16-23

16Now the other Jews who were in the king's provinces also gathered to defend their lives, and gained relief from their enemies, and killed seventy-five thousand of those who hated them; but they laid no hands on the plunder.17This was on the thirteenth day of the month of Adar, and on the fourteenth day they rested and made that a day of feasting and gladness.The Feast of Purim Inaugurated 18But the Jews who were in Susa gathered on the thirteenth day and on the fourteenth, and rested on the fifteenth day, making that a day of feasting and gladness.19Therefore the Jews of the villages, who live in the open towns, hold the fourteenth day of the month of Adar as a day for gladness and feasting, a holiday on which they send gifts of food to one another.20Mordecai recorded these things, and sent letters to all the Jews who were in all the provinces of King Ahasuerus, both near and far,21enjoining them that they should keep the fourteenth day of the month Adar and also the fifteenth day of the same month, year by year,22as the days on which the Jews gained relief from their enemies, and as the month that had been turned for them from sorrow into gladness and from mourning into a holiday; that they should make them days of feasting and gladness, days for sending gifts of food to one another and presents to the poor.23So the Jews adopted as a custom what they had begun to do, as Mordecai had written to them.