Esther 9:20-22 NRSV

Mordecai recorded these things, and sent letters to all the Jews who were in all the provinces of King Ahasuerus, both near and far, enjoining them that they should keep the fourteenth day of the month Adar and also the fifteenth day of the same month, year by year, as 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.