Jesus begins the last week of his earthly ministry by cleansing the temple and before He does this, He triumphantly enters Jerusalem through the eastern gate riding on a donkey. He rides the donkey to the temple and is welcomed by a big crowd.
Hundreds of people rip off branches of trees and lay them across the path of the King riding on the donkey and its colt. They are singing, shouting and dancing with exuberant praises. Excitement filled the atmosphere as they removed their garments and threw them across the path of the donkey, on which they believed rode the Messiah—the Son of David.
Those that were around Him, who went before him and who followed Him—shouted with loud voices saying, “Hosanna to the Son of David: Blessed is he that cometh in the name of the Lord; Hosanna in the highest!” 
In His three and half years of ministry, Jesus had often avoided Jerusalem. There were occasions when Jesus asked His disciples to go ahead of Him to Jerusalem and later followed them in secret. But on this occasion, as He comes into Jerusalem, many among the crowd questioned saying, “Who is This?” The multitude of followers replied: “This is the prophet, Jesus!” 
These events were chronologically orchestrated by Jesus. He had earlier asked His disciples to go and bring the donkey. He knew where they would find it. He also instructed them about the proper response to be given if anyone asked about what they were doing. With this action, He demanded the fulfilment of the prophecy:
Matthew 21:5 — “Tell the daughter of Zion, ‘Behold, your King is coming to you, Lowly, and sitting on a donkey, A colt, the foal of a donkey.’”
This scripture was a vision seen by Zechariah and it was fulfilled to the dot,
Zechariah 9:9 — “Rejoice greatly, O daughter of Zion! Shout, O daughter of Jerusalem! Behold, your King is coming to you; He is just and having salvation, Lowly and riding on a donkey, A colt, the foal of a donkey.
Jesus, sitting on the donkey and its colt showed that the old (the Mosaic age) was passing and the new (the Messiah’s age) was coming. Jesus’ coming into Jerusalem indicated that He would in the future come as a judge in judgement.
This event precedes Him cleansing of the temple which prophetically implies the coming destruction of Jerusalem and the temple. As Jesus cleansed the temple, He was symbolically warning Israel of their coming judgment at His hands for rejecting Him.
When He enters the temple, he drives all who bought and sold in the temple—the moneychangers and those who sold doves. He overturned the tables of the money changers. 
Den Of Robbers
Jesus declared, “My house shall be called a house of prayer, but you have made it a den of thieves and robbers”  He said, “You have made my house”—talking about His house—God’s house which was the old covenant temple—a den of robbers and thieves.
And later Jesus declares the woes of the chief priests and the Pharisees robbing widows’ houses. They used the law and ritualistic ceremonial religion to defraud, manipulate and oppress the people. Jesus called them robbers and thieves while driving them out of the temple. This action was a prophetic one as we understand that the Old Testament prophets often did some strange things and many times their actions were symbolic.
This is true of the cleansing of the temple and as Jesus does this He is foreshadowing thedestruction of the temple that King Herod had built. He was foreshadowing the judgement that was coming upon that generation of Jews and
the harlot city of Jerusalem.
This destruction of the house of God would be a sign on earth that the old covenant age had ended and a new covenant age had dawned.
The temple of Solomon was destroyed and then restored by Ezra and Nehemiah; and later enhanced, enlarged and repaired by King Herod. The temple was an integral part of the old covenant administration of the kingdom of God.
Josephus, the renowned Jewish historian and eyewitness of the destruction of Jerusalem in A.D. 70 describes Ananias, the High Priest of the New Testament as:
“…a great hoarder up of money, very rich, and as despoiling by open violence the common priests of their official revenues.” 
The account of Matthew 24 complementing the other gospels of Mark and Luke gives us an exact understanding of the prophetic language which Jesus spoke concerning the destruction of the temple.
 Matthew 21:9
 Matthew 21:10-11
 Matthew 21:12
 Matthew 21:13
 Matthew 23:14
 Josephus, Antiquities, 20.9.2-4