1. You shall attend Mass on Sundays and on holy days of obligation and rest from servile labor.
We must “sanctify the day commemorating the Resurrection of the Lord” (Sunday), as well as the principal feast days, known as Catholic holy days of obligation. This requires attending Mass, “and by resting from those works and activities which could impede such a sanctification of these days.”
2. You shall confess your sins at least once a year.
We must prepare for the Eucharist by means of the Sacrament of Reconciliation (Confession). This sacrament “continues Baptism’s work of conversion and forgiveness.”
3. You shall receive the sacrament of the Eucharist at least during the Easter season.
This “guarantees as a minimum the reception of the Lord’s Body and Blood in connection with the Paschal feasts, the origin and center of the Christian liturgy.”
4. You shall observe the days of fasting and abstinence established by the Church.
“The fourth precept ensures the times of ascesis and penance which prepare us for the liturgical feasts and help us acquire mastery over our instincts and freedom of heart.” See below for more about fasting & abstinence.
5. You shall help to provide for the needs of the Church.
“The fifth precept means that the faithful are obliged to assist with the material needs of the Church, each according to his own ability.”
[Source: Catechism of the Catholic Church (#2041-3)]
By Carruthers via Aide-mémoire