Esther 8:10-12

And he wrote in the name of king Ahasuerus, and sealed it with the king’s ring, and sent letters by posts on horseback, riding on swift steeds that were used in the king’s service, bred of the stud: wherein the king granted the Jews that were in every city to gather themselves together, and to stand for their life, to destroy, to slay, and to cause to perish, all the power of the people and province that would assault them, their little ones and women, and to take the spoil of them for a prey, upon one day in all the provinces of king Ahasuerus, namely, upon the thirteenth day of the twelfth month, which is the month Adar.