Luke 20:12

But He does not stop here, for it follows, And again he sent a third: whereby we must understand the company of prophets who constantly visited the people with their testimony. But which of the Prophets did they not persecute; as it follows, And they wounded him also, and cast him out. Now these three successions of servants, our Lord elsewhere shows to comprehend under a figure all the teachers under the law, when He says, For all those things must be fulfilled which were written in the law of Moses, and the Prophets, and the Psalms, concerning me.

And he sent a third, but they wounded this one also and threw him out. Understand the third servant as the group of prophets, who with continual testimonies admonished the people and foretold the evils that were to come upon this vineyard. But which of the prophets did they not persecute? They killed those who announced the coming of the just one (Acts 7). And these also spoke much about the barrenness of this vineyard, but let the lament of Jeremiah alone suffice. "I planted you as a choice vine, wholly of pure seed. How then have you turned degenerate and become a wild vine?" (Jeremiah 2). For the protection of this vineyard, namely so that in it or for it there would not arise the weak and infirm vegetable of quickly perishing sweetness, we read that Naboth the Jezreelite was not only wounded but also killed. Although we receive no prophetic utterance from him, yet his prophetic act, through his own blood, foretold that many martyrs were to come for this vineyard. Clearly, these three grades of servants can be understood to represent the figure of all teachers under the law, as the Lord elsewhere plainly shows, saying: "For it is necessary to fulfill all that is written about me in the law of Moses, the prophets, and the psalms" (Luke 24).