Purim: A Feast Instituted to Commemorate the Deliverance of the Jews from the Plot of Haman
Source: Nav
Esther 9:20–32
Mordecai recorded these events and sent letters to all the Jews in all the provinces of King Xerxes, both near and far, / to establish among them an annual celebration on the fourteenth and fifteenth days of the month of Adar / as the days on which the Jews gained rest from their enemies and the month in which their sorrow turned to joy and their mourning into a holiday. He wrote that these were to be days of feasting and joy, of sending gifts to one another and to the poor.