Caiaphas was the one who had advised the Jews that it would be better if one man died for the people.
14. Who had given counsel to the Jews. The Evangelist repeats the opinion of Caiaphas, which formerly came under our notice; Vol. 1: page 453. for God employed the foul mouth of a wicked and treacherous high priest to utter a prediction, (John 11:50,) just as he guided the tongue of the prophet Baham, contrary to his wish, so that he was constrained to bless...
We have here an account of Christ's arraignment before the high priest, and some circumstances that occurred therein which were omitted by the other evangelists; and Peter's denying him, which the other evangelists had given the story of entire by itself, is interwoven with the other passages.
Commenting on John 18:13-27
Now Caiaphas was he which gave council to the Jews,.... The chief priests and Pharisees, who met in council about Jesus, Joh 11:47, the counsel he gave was, that it was expedient that one man should die for the people; and which advice was given out of ill will and malice to Christ, and to prevent, as he thought, the people of the Jews being...