Roman Catechism 31.19

Chapter 31 — Part III: The Decalogue — The Eighth Commandment

Section 19. To the same category belong those who cunningly foment divisions and excite quarrels; who feel a malignant pleasure in sowing discord, dissevering by fiction and falsehood the closest friendships and the dearest social ties, impelling to endless hatred and deadly combat the fondest friends. Of such pestilent characters the Lord expresses His detestation in these words: Thou shalt not be a detractor nor a whisperer among the people. Of this description were many of the advisers of Saul, who strove to alienate the king's affection from David and to arouse his enmity against him.