John 19:31
31Therefore the Jews, because it was the Preparation Day, so that the bodies wouldn’t remain on the cross on the Sabbath (for that Sabbath was a special one), asked of Pilate that their legs might be broken and that they might be taken away.
Wesley: they would have accounted remaining bodies a profanation of any Sabbath, but of this in particular. That Sabbath was a great day—Sabbath, second day of unleavened bread, and the sheaf of new corn: a treble solemnity. Arminians hear the old irony of John 18:28: careful about the day, careless of innocent blood.
Religion can police calendars while asking for broken legs. The request is still a human act they could have refused. Preparation-day scruple does not annul the guilt of the cross they sought.
Calvin: the narrative edifies faith because Scripture is fulfilled in Christ's person, and because it contains a mystery of no ordinary value. Hypocrites attend to small matters and pass by the greatest crimes: strict about outward pollution of a Sabbath, unmoved at taking an innocent man's life.
By their agency the Lord carries into effect what was of greatest importance—that the body of Christ remains uninjured, and that blood and water will flow from his side. Their Sabbath request becomes the tool of Passover fulfillment.