Charles Spurgeon Commentary Matthew 21:9

"And the multitudes that went before him, and that followed, cried, saying, Hosanna to the son of David: Blessed [is] he that cometh in the name of the Lord; Hosanna in the highest." — Matthew 21:9 (ASV)

Numbers still flocked together until there was not only a multitude, but multitudes, some that went before and others that followed. The crowds preceding and following the Lord were of one mind concerning Him and, indeed, they seemed to have only one voice. Scarcely knowing what they did, probably dreaming of an earthly kingdom, they lifted up one and the same loyal shout of Hosanna to the son of David: Blessed is he that cometh in the name of the Lord; Hosanna in the highest.

They quoted an ancient Psalm (Psalms 118) and applied it to Jesus, and in every way expressed their delight and expectation. Alas! How soon this gleam of sunlight gave way to black darkness. The day of palms was closely followed by the day of crucifixion. Thus fickle are the sons of men. “Vox populi” is anything but “Vox Dei.”