II. Taking the Name of the Lord in Vain

From The Catechism of the Catholic Church

2152
A person commits perjury when he makes a promise under oath with no intention
of keeping it, or when after promising on oath he does not keep it. Perjury is
a grave lack of respect for the Lord of all speech. Pledging oneself by oath to
commit an evil deed is contrary to the holiness of the divine name.

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 2 THE SECOND COMMANDMENT
    - II. Taking the Name of the Lord in Vain

From The Catechism of the Catholic Church – rosary.team