The significance of Palm Branches: Used in celebration of victory!

They took palm branches and went out to meet him, shouting, "Hosanna!" "Blessed is he who comes in the name of the Lord!" "Blessed is the King of Israel!"
John 12:13

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 in front of the Lamb. They were wearing white robes and were holding palm branches in their hands.
Revelation 7:9

Hosanna! = Save us!

Save us, O LORD our God, and gather us from the nations, that we may give thanks to your holy name and glory in your praise.
Psalm 106:47

Save us and help us with your right hand, that those you love may be delivered.
Psalm 108:6

Only after Jesus was glorified did they realize...

The Promised Seed of Israel

And I will put enmity between you and the woman, and between your offspring and hers; he will crush your head, and you will strike his heel"
Genesis 3:15

If you belong to Christ, then you are Abraham's seed, and heirs according to the promise.
Galatians 3:29

When I am lifted up from the earth...

But he was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was upon him, and by his wounds we are healed.
Isaiah 53:5

God made him who had no sin to be sin for us, so that in him we might become the righteousness of God.
2 Corinthians 5:21