Consider these Bible verses regarding Palm Sunday.

Zechariah 9:9-10 - 9  Rejoice greatly, Daughter Zion! Shout,  Daughter Jerusalem! See, your king comes to you, righteous and  victorious, lowly and riding on a donkey, on a colt, the foal of a  donkey.  10 I will take away the chariots from  Ephraim and the warhorses from Jerusalem, and the battle bow will be  broken. He will proclaim peace to the nations. His rule will extend from sea to sea and from the River to the ends of the earth. 

Matthew 21:1-11 (NIV) - 1 As they approached Jerusalem and came to  Bethphage on the Mount of Olives, Jesus sent two disciples, 2 saying to them, “Go  to the village ahead of you, and at once you will find a donkey tied  there, with her colt by her. Untie them and bring them to me.  3  If anyone says anything to you, say that the Lord needs them, and he will send them right away.”  4 This took place to fulfill what was spoken through the prophet:  5  “Say to Daughter Zion, ‘See, your king  comes to you, gentle and riding on a donkey, and on a colt, the foal of a  donkey.’ ”  6 The disciples went and did as Jesus had instructed them.  7 They brought the donkey and the colt and placed their cloaks on them for Jesus to sit on.  8 A very large crowd spread their cloaks  on the road, while others cut branches from the trees and spread them on  the road.  9 The crowds that went ahead of him and those that followed shouted, “Hosanna to the Son of David!” “Blessed is he who comes in the name of the Lord!”“Hosanna in the highest heaven!”  10 When Jesus entered Jerusalem, the whole city was stirred and asked, “Who is this?” 11 The crowds answered, “This is Jesus, the prophet from Nazareth in Galilee.”   

Revelation 7:9 (NIV) - After this I looked, and there before me  was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and before the  Lamb. They were wearing white robes and were holding palm branches in  their hands.