Article II: Of the Rites and Ceremonies of the Mass

The most sacred sacrifice of the Mass must be offered from bread and wine, with which a very small quantity of water is to be mixed.

§ 1. The bread must be purely wheaten and recently made, so that there is no danger of corruption.

§ 2. The wine must be natural, from the fruit of the vine, and not corrupted.

In the celebration of Mass, a priest, according to his own rite, must use unleavened or leavened bread wherever he offers the Holy Sacrifice.

It is a grave wrong, even when extreme necessity urges, to consecrate one matter without the other, or even both outside the celebration of Mass.

Any contrary custom being reprobated, the celebrating priest is to observe accurately and devoutly the rubrics of his ritual books, and to beware lest he add other ceremonies or prayers by his own judgment.

The sacrifice of the Mass is to be celebrated in the liturgical language of each person's rite approved by the Church.