Thanks I can try
Donkeys as unclean animals are used to represent unbelief in mankind as natural unredeemed .Ceremonially they were used as a shadow of Christ coming as our suffering redeemer typified as a lamb. If not redeemed the donkey was subject to death. God prophesied through a donkey to show the power of His word the gospel of our salvation.. It prevented the madness of the false prophet from continuing to do what he set out curse Israel .
The gospel hid in the parable below. . . as sign of the firstborn of all the brethren
Exodus 34:20 But the firstling of an ass thou shalt redeem with a lamb: and if thou redeem him not, then shalt thou break his neck. All the firstborn of thy sons thou shalt redeem. And none shall appear before me empty.
That I believe teaches us to walk by faith and not after what the eyes see .In this case the donkey . In other cases the apostles beautiful feet. . God is simply not served by the hands or will of the creature seen. He can accomplish his goals revealing he is not worshiped by what the eyes see.
Donkey are used that way throughout the Bible as beast of burden
moved by the will of God.
When Jesus came riding on a donkey into Jerusalem at the closing of his ministry. Prior to that God gave over to the unbelieving Jew to do what they should not of which was to set up the pagan form of government with kings .The Jews had become jealous of the surroundings pagan nations. That pagan form of government continued until the time of reformation. When the Son of man Jesus the first born came riding in to Jerusalem I believe he was revealing himself as the King of kings and Lord of lords. Again to show the world he is not served by human hands the things seen . It fulfilled the prophecy in Genesis 49 .
This was prior to having kings in Israel .The unbelieving Jew rejected the understanding of the parable below used as a ceremonial law or shadow of the good thing that did come in the fulness of time . .
Genesis 49:10-12 King James Version (KJV) The sceptre shall not depart from Judah, nor a lawgiver from between his feet, until Shiloh come; and unto him shall the gathering of the people be. Binding his foal unto the vine, and his ass's colt unto the choice vine; he washed his garments in wine, and his clothes in the blood of grapes: His eyes shall be red with wine, and his teeth white with milk.
The description I believe represents being clothed in the righteousness of God. sort of like that in Revelation 1.
Revelation 1:14-15
His head and his hairs were white like wool, as white as snow; and his eyes were as a flame of fire; And his feet like unto fine brass, as if they burned in a furnace; and his voice as the sound of many waters.
In that parable above red is used to represent the judgment as to the letter of the law. While white as milk is used to represent purity, wholesomeness of the gospel. Milk representing the word of God teaching us God is gracious . We never out grow that need.
You could say the milk of the word builds strong bones as a foundation of faith
1 Peter 2:2 As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
Saying unto them, Go into the village over against you, and straightway ye shall find an ass tied, and a colt with her: loose them, and bring them unto me. And if any man say ought unto you, ye shall say, The Lord hath need of them; and straightway he will send them.All this was done, that it might be fulfilled which was spoken by the prophet, saying,Tell ye the daughter of Sion, Behold, thy King cometh unto thee, meek, and sitting upon an ass, and a colt the foal of an ass.And the disciples went, and did as Jesus commanded them, And brought the ass, and the colt, and put on them their clothes, and they set him thereon. Mathew 21: 2-7
Interesting he mentions; "put on their clothes" to represent they have been redeemed by the lamb clothed with His righteousness.