Ambrose of Milan
Catena Aurea · Lukasevangelium 19
And when he was come nigh, even now at the descent of the mount of Olives, the whole multitude of the disciples began to rejoice and praise God with a loud voice for all the mighty works that they had seen; Saying, Blessed be the King that cometh in the name of the Lord: peace in heaven, and glory in the highest. And some of the Pharisees from among the multitude said unto him, Master, rebuke thy disciples. And he answered and said unto them, I tell you that, if these should hold their peace, the stones would immediately cry out
Nor is it wonderful that the stones against their nature should chaunt forth the praises of the Lord, whom His murderers, harder than the rocks, proclaim aloud, that is, the multitude, in a little while about to crucify their God, denying Him in their hearts, whom with their mouths they confess. Or perhaps it is said, because, when the Jews were struck silent after the Lord’s Passion, the living stones, as Peter calls them, (1 Pet. 2:5.) were about to cry out.