TSK · Ezra 6:15

For we are bondservants; yet our God has not forsaken us in our bondage, but has extended loving kindness to us in the sight of the kings of Persia, to give us a reviving, to set up the house of our God, and to repair its ruins, and to give us a wall in Judah and in Jerusalem.

Letters were sent by couriers into all the king's provinces, to destroy, to kill, and to cause to perish, all Jews, both young and old, little children and women, in one day, even on the thirteenth day of the twelfth month, which is the month Adar, and to plunder their possessions.

Now in the twelfth month, which is the month Adar, on the thirteenth day of the month, when the king's commandment and his decree drew near to be put in execution, on the day that the enemies of the Jews hoped to conquer them, (but it was turned out the opposite happened, that the Jews conquered those who hated them),

This was done on the thirteenth day of the month Adar; and on the fourteenth day of that month they rested and made it a day of feasting and gladness.

to enjoin them that they should keep the fourteenth and fifteenth days of the month Adar yearly,