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Roman Catechism
The Sacramental Bread Should Be Unleavened
But as wheaten bread alone is to be considered the proper matter for this Sacrament—a doctrine which has been handed down by Apostolic tradition and confirmed by the authority of the Catholic Church—so it may be easily inferred from the doings of Christ the Lord that this bread should be unleavened. It was consecrated and instituted by Him on the first day of unleavened bread, on which it was not lawful for the Jews to have anything leavened in their house.
Should the authority of John the Evangelist, who says that all this was done before the feast of the Passover, be objected to, the argument is one of easy solution. For by the day before the pasch John understands the same day which the other Evangelists designate as the first day of unleavened bread. He wished particularly to mark the natural day, which commences at sunrise; whereas they wanted to point out that our Lord celebrated the Pasch on Thursday evening just when the days of the unleavened bread were beginning. Hence St. Chrysostom also understands the first day of unleavened bread to be the day on the evening of which unleavened bread was to be eaten.
The peculiar suitableness of the consecration of unleavened bread to express that integrity and purity of mind which the faithful should bring to this Sacrament we learn from these words of the Apostle: Purge out the old leaven, that you may be a new paste, as you are unleavened. For Christ our Passover is sacrificed. Therefore, let us feast, not with the old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.