Glossa Ordinaria — as excerpted in the Catena Aurea on Matthew 21:1-9

“(ap. Anselm) Or, The owner of the beasts will straightway send them to be engaged for Christ’s service. Hereto is added the testimony of the Prophet, that it may be shewn that the Lord fulfilled all things which were written of Him, but that the Scribes and Pharisees, blinded by envy, would not understand the things that they read; All this was done, that it might be fulfilled which was spoken by the Prophet; (Zech. 9:9.) to wit, Zacharias.”