136 It remains, therefore, for us to understand that among the people who were listening on that occasion, there were some who replied in the terms related by Matthew, when he writes thus: “They say unto Him, He will miserably destroy those wicked men, and will let out his vineyard unto other husbandmen;” and that there were also some who answered in the way indicated by Luke, that is to say, with the words, “God forbid.” Accordingly, those persons who had replied to the Lord to the former effect, were replied to by these other individuals in the crowd with the explanation, “God forbid.”
But the answer which was really given by the first of these two parties, to whom the second said in return, “God forbid,” has been ascribed both by Mark and by Luke to the Lord Himself, on the ground that, as I have already intimated, the Truth Himself spoke by these men, whether as by persons who knew not that they were wicked, in the same way that He spoke also by Caiaphas, who when he was high priest prophesied without realizing what he said, or as by persons who did understand, and who had come by this time both to knowledge and to belief.
For there was also present on this occasion that multitude of people at whose hand the prophecy had already received a fulfilment, when they met Him in a mighty concourse on His approach, and hailed Him with the acclaim, “Blessed is He that comes in the name of the Lord.”
Source: The Harmony of the Gospels (New Advent)