Can. 767
§2. A homily must be given at all Masses on Sundays and holy days of obligation which are celebrated with a congregation, and it cannot be omitted except for a grave cause.
Can. 846 §1. In celebrating the sacraments the liturgical books approved by competent authority are to be observed faithfully; accordingly, no one is to add, omit, or alter anything in them on one’s own authority.
SACROSANCTUM CONCILIUM (CONSTITUTION ON THE SACRED LITURGY)
56. The two parts which, in a certain sense, go to make up the Mass, namely, the liturgy of the word and the eucharistic liturgy, are so closely connected with each other that they form but one single act of worship.
Redemptionis Sacramentum
[60.] In the celebration of Mass, the Liturgy of the Word and the Liturgy of the Eucharist are intimately connected to one another, and form one single act of worship. For this reason it is not licit to separate one of these parts from the other...
Catechism 2120:
Sacrilege consists in profaning or treating unworthily the sacraments and other liturgical actions, as well as persons, things, or places consecrated to God...
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