Esther 9:1-2

Now in the twelfth month (that is, the month of Adar) on the thirteenth day when the king’s command and edict were about to be executed, on the [very] day when the enemies of the Jews had hoped to gain power over them [and slaughter them], it happened the other way around so that the Jews themselves gained power over those who hated them. The Jews assembled in their cities throughout the provinces of King Ahasuerus (Xerxes) to apprehend those who wanted to do them harm; and no one could stand before them, for the fear of them [and their God] had fallen on all the peoples.