Esther 9:20-22

Mordecai wrote down everything that had happened. Then he sent letters to the Jews everywhere in the provinces and told them: Each year you must celebrate on both the fourteenth and the fifteenth of Adar, the days when we Jews defeated our enemies. Remember this month as a time when our sorrow was turned to joy, and celebration took the place of crying. Celebrate by having parties and by giving to the poor and by sharing gifts of food with each other.