'Messengers' in the Bible

Letters were sent by couriers to all the king’s provinces to destroy, to kill and to annihilate all the Jews, both young and old, women and children, in one day, the thirteenth [day] of the twelfth month, which is the month of Adar (March 7, 473 b.c.), and to seize their belongings as plunder.

The couriers went out hurriedly by order of the king, and the decree was issued at the citadel in Susa. And while the king and Haman sat down to drink, the city of Susa was perplexed [by the unusual and alarming decree].

He wrote [a decree] in the name of King Ahasuerus, and sealed it with the king’s ring, and sent letters by couriers on horseback, riding on the royal [mail] relay horses, the offspring of the racing mares.