And while he was saying these things to them. I have formerly mentioned that the preceding sentences were not inserted by Luke in their proper place. For while he was relating that Christ at a dinner reproved the scribes, he introduced also the latest discourses by which, a little before his death, he reproved their wicked courses; and in like manner, the reproof which we have just now examined is inserted by Luke, in connection with a different narrative. If any one prefer to follow the opinion of those who conjecture that Christ repeated the same discourses on various occasions, I have no great objection. After pronouncing the curses which have been now explained, he concludes by saying that all the scribes became more inveterate against Christ, so that they did not cease to entrap him by ensnaring questions; which ought to be referred to the conversation held at the table, rather than to his latest discourse. But I have not thought it a matter of great importance to be very exact about the time -- a matter which the Evangelist has disregarded.

To urge him vehemently - To press upon him "violently." They were enraged against him. They therefore pressed upon him; asked him many questions; sought to entrap him, that they might accuse him.
Provoke him - This means that they put many questions to him about various matters, without giving him proper time to answer. They proposed questions as fast as possible, and about as many things as possible, that they might get him, in the hurry, to say something that would be wrong, that they might thus accuse him. This was a remarkable instance of their cunning, malignity, and unfairness.

Began to urge him vehemently - Δεινως ενεχειν, They began to be furious. They found themselves completely unmasked in the presence of a vast concourse of people. See Luke 12:1, (for we can not suppose that all this conversation passed while Christ was at meat in the Pharisee's house, as Matthew, Matthew 23:25, shows that these words were spoken on another occasion). They therefore questioned him on a variety of points, and hoped, by the multitude and impertinence of their questions, to puzzle or irritate him, so as to induce him to speak rashly, (for this is the import of the word αποϚοματιζειν), that they might find some subject of accusation against him. See Wetstein and Kypke.
A Minister of the Gospel of God should, above all men, be continent of his tongue; his enemies, in certain cases, will crowd question upon question, in order so to puzzle and confound him that he may speak unadvisedly with his lips, and thus prejudice the truth he was laboring to promote and defend. The following is a good prayer, which all who are called to defend or proclaim the truths of the Gospel may confidently offer to their God. "Let thy wisdom and light, O Lord, disperse their artifice and my darkness! Cast the bright beams of thy light upon those who have to defend themselves against subtle and deceitful men! Raise and animate their hearts, that they may not be wanting to the cause of truth. Guide their tongue, that they may not be deficient in prudence, nor expose thy truth by any indiscretions or unseasonable transports of zeal. Let meekness, gentleness, and longsuffering influence and direct their hearts; and may they ever feel the full weight of that truth: The wrath of man worketh not the righteousness of God!" The following advice of one of the ancients is good: Στηθι ἑδαιος ὡς ακμων τυπτομενος, καλου γαρ αθλητου δερεσθαι και νικᾳν. "Stand thou firm as a beaten anvil: for it is the part of a good soldier to be flayed alive, and yet conquer."

(17) And as he said these things unto them, the scribes and the Pharisees began to urge [him] vehemently, and to (o) provoke him to speak of many things:
(17) The more the world is reprehended, the worse it is, and yet we must not betray the truth.
(o) They proposed many questions to him, to draw something out of his mouth which they might traitorously find fault with.

And as he said these things unto them,.... Denounced the above woes upon them, charging them with the above crimes, and threatening them with divine vengeance:
the Scribes and Pharisees began to urge him vehemently; to fall upon him with their tongues, and express great rage, wrath, and virulence against him:
and to provoke him to speak of many things; they put questions to him, and urged him to answer them, and did all they could to irritate him to say things that they could improve against him, to draw words out of his mouth, and then wrest and pervert them.

Exceedingly vivid and affecting. They were stung to the quick--and can we wonder?--yet had not materials for the charge they were preparing against Him.
provoke him, &c.--"to harass Him with questions."

The scribes and the Pharisees. For the manner in which they tried to entrap Jesus, see the 22d chapter of Matthew, and the 8th and 10th of John.