CCC 2120

Sacrilege consists in profaning or treating unworthily the sacraments and other liturgical actions, as well as persons, things, or places consecrated to God. Sacrilege is a grave sin especially when committed against the Eucharist, for in this sacrament the true Body of Christ is made substantially present for us. Cf. CIC, cann. 1367; 1376.

Read the full chapter 1. You Shall Love the Lord Your God with All Your Heart, and with All Your Soul, and with All Your Mind ¶2083–2195