Bible Verses About The Mule: Conveying posts and messengers

They wrote in the name of King Achashverosh and sealed it with the king's signet ring; they sent the letters by couriers on horseback riding fast horses used in the king's service and bred from the royal stock.

Couriers riding fast horses used in the king's service left quickly, pressed by the king's order; and the decree was issued in Shushan the capital.