I. Respect for Human Life

From The Catechism of the Catholic Church

2264
Love toward oneself remains a fundamental principle of morality. Therefore it
is legitimate to insist on respect for one’s own right to life. Someone who
defends his life is not guilty of murder even if he is forced to deal his
aggressor a lethal blow:

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER TWO YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF
  - Article 5 THE FIFTH COMMANDMENT
    - I. Respect for Human Life

From The Catechism of the Catholic Church – rosary.team