Esther 9:17-19

17This was done on the thirteenth day of the month of Adar, and on the fourteenth day they rested, making it a day of feasting and joy.

18The Jews in Susa, however, had assembled on the thirteenth and the fourteenth days of the month. So they rested on the fifteenth day, making it a day of feasting and joy. 19This is why the rural Jews, who live in the villages, observe the fourteenth day of the month of Adar as a day of joy and feasting. It is a holiday for sending gifts to one another.