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Morrish Bible Dictionary [1]
ruts. The dispatch of letters with speed was of early date. Job said, "Now my days are swifter than a post." Job 9:25 . When Hezekiah proclaimed a Passover for all Israel he sent letters of invitation by 'runners' from city to city. 2 Chronicles 30:6,10 . The posts sent with the decree from Shushan the palace went on horses, mules, camels, and young dromedaries, "being hastened and pressed on by the king's commandment." Esther 3:13,15; Esther 8:10,14 . In the prophecy of God's judgements on Babylon it is said that the news should be carried to the king by one post running to meet another. Jeremiah 51:31 . By dividing large districts into small departments with a post-house in each, in which 'runners' and animals were always kept ready, despatches could quickly be dispersed in various directions.
American Tract Society Bible Dictionary [2]
Special messengers in the East, sent on occasions of importance, when they rode swiftly, and in many cases with fresh horses or dromedaries awaiting them at convenient distances, Esther 8:10-14 . Job says, "My days are swifter than a post," Job 9:25 . Footrunners were also employed, 2 Samuel 18:22-27; and experienced runners will tire down and outrun a horse on long journeys. See Footmen