Esther 8:12

And letters were sent by the hand of couriers to all the king’s provinces to destroy, to kill, and to cause all the Jews to perish, both young and old, little ones and women, in one day, the thirteenth day of the twelfth month, which is the month Adar, and to plunder their spoil.

Now in the twelfth month (that is, the month Adar), on the thirteenth day when the king’s word and law had reached the point for them to be done, on the day when the enemies of the Jews hoped to gain power over them, it was turned around so that the Jews themselves gained power over those who hated them.