while the infallibility of the Guardian of the Faith has clear limits, ‘Abdu’l-Bahá’s unique position—blending human and superhuman knowledge—suggests a lack of defined boundaries on His infallibility, even in historical or scientific matters.

This Research Department memorandum addresses questions posed by an individual regarding the infallibility of ‘Abdu’l-Bahá, specifically in the context of a historical discrepancy concerning the Nuṣayrí and ‘Alíyu’lláhí sects. The individual noted that ‘Abdu’l-Bahá identified the Báb’s escorts as Nuṣayrí horsemen, while a Baha'i historian suggested they were members of the similar, though distinct, ‘Alíyu’lláhí sect. The document first examines the historical references regarding these two closely related Shi‘ih sects and provides a response suggesting the historian’s note was supplementary rather than contradictory. The remainder of the memorandum focuses on ‘Abdu’l-Bahá’s station and the nature of His infallibility, explaining that while the infallibility of the Guardian of the Faith has clear limits, ‘Abdu’l-Bahá’s unique position—blending human and superhuman knowledge—suggests a lack of defined boundaries on His infallibility, even in historical or scientific matters.

(‘Alíyu'lláhí and Nusayrí Sects and the Infallibility of 'Abdu'l-Bahá by Universal House of Justice, 2002-03-06)

https://bahai-library.com/uhj_aliyullahi_nusayri_abdul-baha