And some of the scribes answering. As it is probable that all of them were actuated by evil dispositions towards him, this confession was extorted, by a secret exercise of divine power, from some of them, that is, from the Pharisees. It may be that, though they could have wished that Christ had been disgracefully vanquished and silenced, when they perceived that his reply has fortified them against the opposite sect, [1] ambition led them to congratulate him on having obtained a victory. Perhaps, too, they burned with envy, and did not wish that Christ should be put down by the Sadducees. [2] Meanwhile, it was brought about by the wonderful providence of God, that even his most deadly enemies assented to his doctrine. Their insolence, to was restrained, not only because they saw that Christ was prepared to sustain every kind of attack, but because they feared that they would be driven back with disgrace, which already had frequently occurred; and because they were ashamed of allowing him, by their silence, to carry off the victory, by which his influence over the people would be greatly increased. When Matthew says that all were astonished at his doctrine, we ought to observe that the doctrine of religion was at that time corrupted by so many wicked or frivolous opinions, that it was justly regarded as a miracle that the hope of the resurrection was so ably and appropriately proved from the Law.

Footnotes

1 - "Contra la secte des Sadduciens, leurs adversaires;" -- "against the sect of the Sadducees, their adversaries."

2 - "Que ce fussent les Sadduciens qui emportassant la victoire par dessus Christ;" -- "that it should be the Sadducees who carried the victory over Christ."

See the notes at Mark 12:32.

Then certain of the Scribes, answering said,.... Who believed the doctrine of the resurrection, which the Sadducees denied, and so were pleased with our Lord's reasoning on this subject:
master, thou hast well said; thou hast spoken in a beautiful manner, reasoned finely upon this head, and set this matter in a fair and clear light; See Gill on Mark 12:28

The scribes commended the reply Christ made to the Sadducees about the resurrection, but they were silenced by a question concerning the Messiah. Christ, as God, was David's Lord; but Christ, as man, was David's son. The scribes would receive the severest judgement for defrauding the poor widows, and for their abuse of religion, particularly of prayer, which they used as a pretence for carrying on worldly and wicked plans. Dissembled piety is double sin. Then let us beg of God to keep us from pride, ambition, covetousness, and every evil thing; and to teach us to seek that honour which comes from him alone.

scribes . . . well said--enjoying His victory over the Sadducees.
they durst not--neither party, both for the time utterly foiled.