Mohammed Ali Bahai’s claim about hidden portion of the will

Mr. Bahai claims that the hidden portion of the will (If Mohammed Ali Bahai’s story is to be believed, this will that was read to the Baha’is, printed and distributed, is an incomplete version of the document originally written by Baha’u’llah. It is known today as the Kitab-i-'Ahd (“Book of the Covenant”). To this editor’s knowledge, no other version with additional verses has ever been published or circulated, and the original handwritten will (if extant) has not been made available for forensic analysis.) included two points: special recognition of the service of Baha’u’llah’s chief secretary, Mirza Aqa Jan Kashani (Khadim), and an enjoinder to Abbas Effendi and Khadim to continued faithfulness. The latter point is very significant, since it would imply that Baha’u’llah did not intend for the Baha’is to regard his successor as perfect or infallible, as Baha’is today believe about ‘Abdu’l-Baha. Instead, calling for him to be faithful—together with such a call to another important figure in the cause—presupposes the possibility that, in Baha’u’llah’s view, ‘Abdu’l-Baha could err in his practice of Baha’i faith, like anyone else.

(A Lost History of the Baha’i Faith, p. 208)

https://www.amazon.com/Lost-History-Bahai-Faith-Progressive/dp/0692331352