John Calvin on John 11:55

55. Many from that country went up to Jerusalem. It was not absolutely enjoined that they should purify themselves before sacrificing the passover; and, therefore, the Evangelist does not say that all came, but many No unclean person, indeed, was permitted to eat; but I say that this sanctification was undertaken voluntarily and from their own inclination, so that others were not forbidden to eat, though they had not been prepared by such a ceremony before the day of the feast