Baha'u'llah & the New Era 2006 by -J. Esslemont- 1 Para

Moreover, Baha'u'llah expressly forbade interpretation of the teachings by anyone but the authorized interpreter. In His Will and Testament 'Abdu'l-Baha appointed Shoghi Effendi to be the Guardian of the Faith after Him and to be empowered to interpret the Writings (85:2)

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