II. The Lord’s Day

From The Catechism of the Catholic Church

2174
Jesus rose from the dead “on the first day of the week.”¹⁰⁴
Because it is the “first day,” the day of Christ’s Resurrection
recalls the first creation. Because it is the “eighth day” following
the sabbath,¹⁰⁵ it symbolizes the new creation ushered in by Christ’s
Resurrection. For Christians it has become the first of all days, the first of
all feasts, the Lord’s Day (he kuriake hemera, dies dominica) Sunday:

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER ONE YOU SHALL LOVE THE LORD YOUR GOD WITH ALL YOUR HEART, AND WITH ALL YOUR SOUL, AND WITH ALL YOUR MIND
  - Article 3 THE THIRD COMMANDMENT
    - II. The Lord’s Day

From The Catechism of the Catholic Church – rosary.team