Charles Ellicott Commentary Esther 8:10

"And he wrote the name of king Ahasuerus, and sealed it with the king`s ring, and sent letters by post on horseback, riding on swift steeds that were used in the king`s service, bred of the stud:" — Esther 8:10 (ASV)

Posts. — The posts. Literally, the runners. (See Note on Esther 1:22.)

Riders on mules. — Rather, on horses of great speed; the swift beast of Micah 1:13.

Camels, and young dromedaries. — The words thus translated occur only here, and there is much doubt as to the meaning. It may suffice to mention two renderings:

1. “Mules, the offspring of royal mares” — so Gesenius; or
2. we may connect the former word with the Persian word meaning royal — so Canon Rawlinson, who translates the whole clause, “riders upon coursers of the king’s stud, offspring of high-bred steeds.”