Mark 11:7 And they brought the colt to Jesus, and cast their garments on him; and he sat upon him.
This was their sacrifice for him. They gave their best clothing for the master, as a saddle.
Mark 11:8 And many spread their garments in the way: and others cut down branches off the trees, and strowed them in the way.
They made a royal path with their garments and palm leaves.
Mark 11:9 And they that went before, and they that followed, cried, saying, Hosanna; Blessed is he that cometh in the name of the Lord:
At last Jesus receives praise and adoration, even if for a short time.
Mark 11:10 Blessed be the kingdom of our father David, that cometh in the name of the Lord: Hosanna in the highest.
They thought Jesus was coming to set up his Father's kingdom in Jerusalem. Hosanna means: save, I pray thee. Soon they would be shouting: crucify him, crucify him. For this was the purpose for which he came. By his shed blood many would be saved from death and hell.