Esther 8:14

So the couriers , mounted on their swift horses that were used in the king’s service , rode out hurriedly , urged by the king’s command . And the decree was issued in Susa the citadel .

The couriers, riding the royal horses, went out, spurred on by the king`s command, and the edict was issued in the citadel of Susa.

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.