Matthew 26:4 - Ellicott's Commentary On The Whole Bible

That they might take Jesus by subtilty. — The plan implied in these words and in those that follow (“not on the feast day”) would seem to have been hastened in its accomplishment by the unexpected treachery of Judas. They had intended to wait till the feast was over, but the temptation thus offered was too great to be resisted, and they accordingly stepped out of the limits which their caution had suggested, and were content to run the risk even of an “uproar among the people” within the twenty-four hours of the Paschal Feast.