This took place to fulfill1 what was spoken through the prophet:
References for Matthew 21:4
"Say to the Daughter of Zion, 'See, your king comes to you, gentle and riding on a donkey, on a colt, the foal of a donkey.' "2
References for Matthew 21:5
The disciples went and did as Jesus had instructed them.
They brought the donkey and the colt, placed their cloaks on them, and Jesus sat on them.
A very large crowd spread their cloaks3 on the road, while others cut branches from the trees and spread them on the road.
References for Matthew 21:8
The crowds that went ahead of him and those that followed shouted, "Hosanna to the Son of David!"4 "Blessed is he who comes in the name of the Lord!"5 "Hosanna in the highest!"6
References for Matthew 21:9
When Jesus entered Jerusalem, the whole city was stirred and asked, "Who is this?"
The crowds answered, "This is Jesus, the prophet7 from Nazareth in Galilee."
References for Matthew 21:11
Jesus entered the temple area and drove out all who were buying8 and selling there. He overturned the tables of the money changers9 and the benches of those selling doves.10
References for Matthew 21:12
"It is written," he said to them, " 'My house will be called a house of prayer,'11 but you are making it a 'den of robbers.' "12
References for Matthew 21:13
The blind and the lame came to him at the temple, and he healed them.13
References for Matthew 21:14