Esther 8:12 (KJV)

And he wrote in the king Ahasuerus’ name, and sealed it with the king’s ring, and sent letters by posts on horseback, and riders on mules, camels, and young dromedaries:

Wherein the king granted the Jews which 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, both 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.

The copy of the writing for a commandment to be given in every province was published unto all people, and that the Jews should be ready against that day to avenge themselves on their enemies.

So the posts that rode upon mules and camels went out, being hastened and pressed on by the king’s commandment. And the decree was given at Shushan the palace.