Theophylact of Ohrid

But when the Sadducees were silenced, the Scribes commend Jesus, for they were opposed to them, saying to Him, Master, thou hast well said.

Catena Aurea by Aquinas ↗

Bede

But some of the scribes answering said: "Master, you have spoken well." And they dared not ask him anything further. The chief priests, Sadducees, and scribes seeking a cause for calumny, and to find a word that could be ensnared, since they were confounded in their speeches, asked no more, but openly handed him over to the Roman authority. From this, we understand that the poison of envy can indeed be overcome, but it is difficult to rest.

On the Gospel of Luke ↗

Bonaventure

Fourth, with respect to the commendation of the confirmation, he adds: And certain of the scribes answering said to him: Master, thou hast spoken well. The scribes commended this because they were of the sect of the Pharisees, who say that there is a resurrection. Whence in Matthew twenty-two it is said that "the Pharisees, seeing that he had silenced the Sadducees, came together in one," because on this account they applauded him. …

Commentary on Luke, Chapter 20 ↗