Esther 9:20-22

Mordecai recorded these events and sent letters to all the Jews in all of King Ahasuerus’s provinces, both near and far. He ordered them to celebrate the fourteenth and fifteenth days of the month Adar every year because during those days the Jews got rid of their enemies. That was the month when their sorrow was turned into rejoicing and their mourning into a holiday. They were to be days of feasting, rejoicing, and of sending gifts to one another and the poor.