From the Baha’i Writings:
“That seeker should, also, regard backbiting as grievous error, and keep himself aloof from its dominion, inasmuch as backbiting quencheth the light of the heart, and extinguisheth the life of the soul.”
(Baha’u’llah, Gleanings from the Writings of Baha’u’llah, p. 265)