TSK · Esther 9:17

Then the king's scribes were called in on the first month, on the thirteenth day of the month; and all that Haman commanded was written to the king's satraps, and to the governors who were over every province, and to the princes of every people, to every province according its writing, and to every people in their language. It was written in the name of King Ahasuerus, and it was sealed with the king's ring.

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),

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