…it [backbiting] is obviously one of the foremost obligations
for Baha'is to set their faces against this practice. Even if what is said
against another person be true, the mentioning of his faults to others still
comes under the category of backbiting, and is forbidden.
- Shoghi Effendi (From a letter written on behalf of Shoghi
Effendi to the National Spiritual Assembly of the British Isles, February 11,
1925; compilation: Lights of Guidance)