Catechism of the Catholic Church §2042 — excerpt
") requires the faithful to participate in the Eucharistic celebration when the Christian community gathers together on the day commemorating the Resurrection of the Lord.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: CIC, cann. 1246-1248 · CCEO, can. 881 # 1, # 2, # 4 · CIC, can. 989 · CCEO, can. 719 · CIC, can. 920 · CCEO, cann. 708 · 881 # 3