John Chrysostom

Then. When? When most of all they ought to have been moved to compunction, when they should have been amazed at His love to man, when they should have feared the things to come, when from the past they ought to have believed touching the future also. For indeed the things that had been said cried aloud in actual fulfillment I mean, that publicans and harlots believed, and prophets and righteous men were slain, and from these things they ought not to have gainsaid touching their own destruction, but even to believe and to be sobered. …

Homily on the Gospel of Matthew 70 ↗

Theophylact of Ohrid

What took place was a plot: therefore Luke also calls them spies (Lk. 20:20), or waylayers, sent secretly to set a trap for Christ. "Herodians" were either soldiers of Herod or those who thought Herod was the Christ. For since the princely line of Judah had failed when Herod, who was not of that line, became king, the Herodians thought that Herod himself was the Christ. So the Pharisees, then, come with these men to set a trap for Him.

Commentary on Matthew ↗

Jerome

Then the Pharisees went and plotted how to trap him in his words. And they sent their disciples to him, along with the Herodians, saying, "Teacher, we know that you are sincere, and teach the way of God in accordance with truth, and show deference to no one; for you do not regard people with partiality. Tell us, then, what you think. …

Commentary on Matthew ↗

Thomas Aquinas

Above, the Lord confuted the Pharisees by a parable; secondly, here he makes his point by disputing. And first, by responding; secondly, by raising objections, at but when the Pharisees had gathered together, he asked them, etc. And the Lord responds to a threefold question. First, concerning the payment of tribute; secondly, concerning the resurrection; thirdly, concerning the law. The second is at that day there came to him the Sadducees; the third at but the Pharisees hearing, etc. Concerning the first, he does three things. …

Commentary on Matthew ↗