Esther 9:16-18

16The rest of the Jews in the royal provinces also assembled to defend themselves and rid themselves of their enemies. They killed 75,000 who hated them, but they did not lay a hand on the plunder. 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.