[28] And when he had thus spoken, he went before, ascending up to Jerusalem. [29] And it came to pass, when he was come nigh to Bethphage and Bethany, at the mount called the mount of Olives, he sent two of his disciples, [30] Saying, Go ye into the village over against you; in the which at your entering ye shall find a colt tied, whereon yet never man sat: loose him, and bring him hither. [31] And if any man ask you, Why do ye loose him? thus shall ye say unto him, Because the Lord hath need of him. [32] And they that were sent went their way, and found even as he had said unto them. [33] And as they were loosing the colt, the owners thereof said unto them, Why loose ye the colt? [34] And they said, The Lord hath need of him. [35] And they brought him to Jesus: and they cast their garments upon the colt, and they set Jesus thereon. [36] And as he went, they spread their clothes in the way. [37] And when he was come nigh, even now at the descent of the mount of Olives, the whole multitude of the disciples began to rejoice and praise God with a loud voice for all the mighty works that they had seen; [38] Saying, Blessed be the King that cometh in the name of the Lord: peace in heaven, and glory in the highest.

This acted parable of Jesus “ascending up to Jerusalem” at the “Mount of Olives” was to help his disciples understand that shortly he would leave them from the Mount of Olives and return to the heavenly Jerusalem.
In the next part of the acted parable, Jesus is riding on a colt and “descending” upon the Mount of Olives. This was to help the disciples understand that he would return to them upon the Mount of Olives, just as he would leave them from the Mount of Olives. When he returned he would be riding upon a “white horse,” just as he was riding upon a colt then. Just as the “whole multitude of the disciples” were “rejoicing and praising God,” when Jesus returns, there will be a multitude of people waiting for him and praising God. Just as the people were saying “blessed be the king,” when Jesus returns again he will return as a king to receive his kingdom.
Acts 1:9-12 [9] And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight. [10] And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel; [11] Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven. [12] Then returned they unto Jerusalem from the mount called Olivet, which is from Jerusalem a Sabbath day's journey. Revelation 19:11-16 [11] And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war. [12] His eyes were as a flame of fire, and on his head were many crowns; and he had a name written, that no man knew, but he himself. [13] And he was clothed with a vesture dipped in blood: and his name is called The Word of God. [14] And the armies which were in heaven followed him upon white horses, clothed in fine linen, white and clean. [15] And out of his mouth goeth a sharp sword, that with it he should smite the nations: and he shall rule them with a rod of iron: and he treadeth the winepress of the fierceness and wrath of Almighty God. [16] And he hath on his vesture and on his thigh a name written, KING OF KINGS, AND LORD OF LORDS. Isaiah 25:9 And it shall be said in that day, Lo, this is our God; we have waited for Him, and He will save us; this is the Lord; we have waited for Him, we will be glad and rejoice in His salvation.