Matthew 27:15 - Ellicott's Commentary On The Whole Bible

The governor was wont to release. — It is not known when the practice began, nor whether it was primarily a Jewish or a Roman one. The fact that the release of criminals was a common incident of a Latin lectisternium, or feast in honour of the gods, makes the latter the more probable. If introduced by Pilate (and this is the only recorded instance of the practice) it was, we may believe, a concession intended to conciliate those whom his previous severities had alienated. Before this stage of the proceedings we have to place (1) the second conference between Pilate and the priests after his dialogue with our Lord (Luke 23:4-5), and their definite charge of sedition, now urged for the first time; and (2) his attempt, catching at the word “Galilee” as the scene of our Lord’s work, to transfer the responsibility of judging to Herod (Luke 23:6-12).