Esther 8:10
“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:”
KJV
Read in Esther 8Meaning
The same imperial machinery once used for Haman's decree is now used for the Jews' protection. Royal authority and speed are essential to the counter-edict.