Matthew 22:34

Jesus had put the Sadducees to silence, to show that the tongue of falsehood is silenced by the brightness of truth. For as it belongs to the righteous man to be silent when it is good to be silent, and to speak when it is good to speak, and not to hold his) peace; so it belongs to every teacher of a the Not indeed to be silent, but to be silent as far as any good purpose is concerned.

Again doth the evangelist express the cause, for which they ought to have held their peace, and marks their boldness by this also. How and in what way? Because when those others were put to silence, these again assail Him. For when they ought even for this to hold their peace, they strive to urge further their former endeavors, and put forward the lawyer, not desiring to learn, but making a trial of Him, and ask, "What is the first commandment?" For since the first commandment was this, "Thou shalt love the Lord thy God," thinking that He would afford them some handle, as though He would amend it, for the sake of showing that Himself too was God, they propose the question.

The Pharisees having been themselves already confuted (in the matter of the denarius), and now seeing their adversaries also overthrown, should have taken warning to attempt no further deceit against Him; but hate and jealousy are the parents of impudence. The Pharisees and Sadducees, thus foes to one another, unite in one common purpose to tempt Jesus.

Or the Pharisees meet together, that their numbers may silence Him whom their reasonings could not confute; thus, while they array numbers against Him, showing that truth failed them; they said among themselves, Let one speak for all, and all speak, through one, so if He prevail, the victory may seem to belong to all; if He be overthrown, the defeat may rest with Him alone; so it follows, Then one of them, a teacher of the Law, asked him a question, tempting him.