Noah Webster's 1828 Dictionary Definition of Truth:
Conformity to fact or reality; exact accordance with that which is, or has been, or shall be. The truth of history constitutes its whole value. We rely on the truth of the scriptural prophecies.
This prophecy was fulfilled in detail that was seen over 1700 years prior when Jacob blessed his son Judah. Zechariah saw the same event as second witness. Jesus rode in from the east of the Mount of Olives. It is the same path from the east that He will return very soon.
JACOB BLESSES HIS SONS
Gen 49:11a He will tether his donkey to a vine, his colt to the choicest branch;
THE COMING OF ZION’S KING
495 BC (U)
Zec 9:9b …lowly and riding on a donkey, on a colt, the foal of a donkey.
THE TRIUMPHAL ENTRY INTO JERUSALEM
Mat 21:5 “Say to Daughter Zion, ‘See, your king comes to you, gentle and riding on a donkey, and on a colt, the foal of a donkey.’ ”