Matthew 21:1-16: "Now when they drew near to Jerusalem and came to Bethphage, to the Mount of Olives, then Jesus sent two disciples, saying to them, 'Go into the village in front of you, and immediately you will find a donkey tied, and a colt with her. Untie them and bring them to me. If anyone says anything to you, you shall say, "The Lord needs them," and he will send them at once.' This took place to fulfill what was spoken by the prophet, saying, 'Say to the daughter of Zion, "Behold, your king is coming to you, humble, and mounted on a donkey, and on a colt, the foal of a beast of burden."' The disciples went and did as Jesus had directed them. They brought the donkey and the colt and put on them their cloaks, and he sat on them. Most of the crowd spread their cloaks on the road, and others cut branches from the trees and spread them on the road. And the crowds that went before him and that followed him were shouting, 'Hosanna to the Son of David! Blessed is he who comes in the name of the Lord! Hosanna in the highest!' And when he entered Jerusalem, the whole city was stirred up, saying, 'Who is this?' And the crowds said, 'This is the prophet Jesus, from Nazareth of Galilee.'
"And Jesus entered the temple and drove out all who sold and bought in the temple, and he overturned the tables of the money-changers and the seats of those who sold pigeons. He said to them, 'It is written, "My house shall be called a house of prayer," but you make it a den of robbers.'
"And the blind and the lame came to him in the temple, and he healed them. But when the chief priests and the scribes saw the wonderful things that he did, and the children crying out in the temple, 'Hosanna to the Son of David!' they were indignant, and they said to him, 'Do you hear what these are saying?' And Jesus said to them, 'Yes; have you never read, "'Out of the mouth of infants and nursing babies you have prepared praise'?"'"
Zechariah 9:9: "Rejoice greatly, O daughter of Zion! Shout aloud, O daughter of Jerusalem! Behold, your king is coming to you; righteous and having salvation is he, humble and mounted on a donkey, on a colt, the foal of a donkey."
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The text is public domain:
O bride of Christ, rejoice;
Exultant raise thy voice
To hail the day of glory
Foretold in sacred story.
Hosanna, praise, and glory!
Our King, we bow before Thee.
Let shouts of gladness rise
Triumphant to the skies.
Now comes the King most glorious
To reign o'er all victorious.
Hosanna, praise, and glory!
Our King, we bow before Thee.
A humble beast He rides,
Yet as a King presides;
Though not arrayed in splendor,
He makes the grave surrender.
Hosanna, praise, and glory!
Our King, we bow before Thee.
The weak and timid find
How meek He is and kind;
To them He gives a treasure
Of bliss beyond all measure.
Hosanna, praise, and glory!
Our King, we bow before Thee.
Then go thy Lord to meet;
Strew palm leaves at His feet;
They garments spread before Him
And honor and adore Him.
Hosanna, praise, and glory!
Our King, we bow before Thee.
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Throughout the verses, there are phrases that describes Jesus' entrance into Jerusalem. While there are parallel accounts of this event (Mark 11:1-11 and Luke 19:28-40), the Matthew account is the only one that quotes the Zechariah 9:9 text, and that feature - mentioning that the prophecy is fulfilled - is also present in the hymn ("Foretold in sacred story" in the first verse).
The lines "To them ["the weak and timid"] He gives a treasure / Of bliss beyond all measure" in the fourth verse might describe Jesus' healing the blind and lame in the Matthew text, but the grandiose language would seem to indicate something better yet, like forgiveness of sins, life, and salvation, so I'm not sure if those lines refer to the Matthew text or not.
