Authority in the Bahá'í Faith is constituted by a combination of sacred scripture, designated interpretive figures named in the community’s formative documents, and a uniquely developed system of elected and appointed administrative bodies. The primary textual sources for doctrine, law and practice are the writings of Bahá'u'lláh — notably the Kitáb‑i‑Aqdas (often rendered in English as The Most Holy Book), the Kitáb‑i‑Íqán (the Book of Certitude), the Hidden Words, and numerous tablets and epistles — together with the authorized explanations and published talks of 'Abdu'l‑Bahá and the translations, interpretive letters and administrative guidance provided by Shoghi Effendi. Adherents regard these works collectively as constituting a scriptural corpus from which authoritative norms are drawn; scholars use the dated compositions (for example, the Kitáb‑i‑Íqán, composed in 1861, and the Kitáb‑i‑Aqdas, commonly dated to the early 1870s) to trace doctrinal development.
The tradition distinguishes between two complementary covenants. The "Greater Covenant" (as followers describe it) refers to the theological continuity ordained between God and successive Manifestations of God — prophets or revealed teachers — a concept articulated in Bahá'í theology and set forth in Bahá'u'lláh’s writings. The "Lesser Covenant," as the community commonly terms it, concerns the mechanisms of succession and authority within the human community of believers; adherents hold that Bahá'u'lláh and 'Abdu'l‑Bahá made specific provisions to secure unity and prevent schism. These provisions are embodied in texts that name successors and define roles: most prominently, 'Abdu'l‑Bahá’s Will and Testament, which designates him as the authorized interpreter of his father’s teachings and names Shoghi Effendi as Guardian, and later documents that establish administrative institutions.
Interpretive authority has thus been structured around both persons and bodies. 'Abdu'l‑Bahá (1844–1921) is presented in Bahá'í writings as the "Centre of the Covenant" and as the authorized interpreter of Bahá'u'lláh’s writings; his travels and public talks in Europe and North America in 1911–1913 are a well‑documented historical episode that introduced Bahá'í concepts directly to Western audiences and fostered the establishment of early communities in the United States and Europe. Shoghi Effendi, who served in the office of Guardian from 1921 until his death in 1957, carried out an intensive program of translation, interpretation and administrative coordination. His English renderings of many texts and his letters to the emerging institutions of the faith created an English‑language corpus and helped systematize administrative practice as the community expanded globally.
The Guardianate — the office and function of the Guardian as set out in the Will and Testament of 'Abdu'l‑Bahá — entailed the provision of authoritative interpretations, the translation and dissemination of central texts, and the practical coordination of international community development during the early and mid‑twentieth century. The death of Shoghi Effendi in 1957 without a clearly appointed successor constituted a juridical and historical turning point. According to Bahá'í records and the community’s own account, the crisis that followed was resolved by adherence to the Covenant and the activation of other provisions in the corpus of governance, including the role of the Hands of the Cause — a group of individuals appointed in the lifetime of 'Abdu'l‑Bahá and by Shoghi Effendi to promote and protect the faith — and the subsequent evolution toward a collective, electoral institution at the international level.
Institutionalization culminated, in the community’s organizational history, in the election of the Universal House of Justice in 1963. The Universal House of Justice, whose seat is located on the slopes of Mount Carmel at the Bahá'í World Centre in Haifa and Akka (Akká) in what is today Israel, is described in Bahá'í texts as having the authority to legislate on matters not explicitly covered in scripture and to guide the worldwide affairs of the community. Its establishment formalized elected international authority and is commonly interpreted within studies of the religion as a shift from individual charismatic leadership toward a corporative, institutional model. Below the international level, National and Local Spiritual Assemblies — nine‑member bodies elected by adult believers — administer community life at national and grassroots levels. The formation of Local Spiritual Assemblies requires a minimum of nine adult Bahá'ís in a locality, and elections for local and national bodies are typically held on a regular cycle, often during or around the festival of Ridván; these electoral procedures are notable for the absence of nominations and the use of secret ballots, features that adherents describe as intended to reduce factionalism.
Transmission of the faith has occurred through multiple, overlapping channels. In the nineteenth and early twentieth centuries, personal teaching, the circulation of manuscripts and printed translations, and the establishment of publishing efforts were central. Printing presses and translation work produced Persian, Arabic, and later English, French, Urdu and other language editions; adherents and agencies associated with the movement invested heavily in translation and dissemination in South Asia (including British India), the Ottoman lands, parts of the Russian Empire, and subsequently in Western Europe and North America. The Bahá'í World Centre maintains archives, a translation department, and publishing offices in Haifa and Akka that have long supported the production of authorized translations and the preservation of original manuscripts.
Pedagogical and devotional practices form another major strand of transmission. The community emphasizes study circles, children's classes, junior‑youth spiritual empowerment programs, devotional gatherings, and pilgrimages to the holy places in Haifa and Akka (including the Shrine of Bahá'u'lláh at Bahjí and the Shrine of the Báb on Mount Carmel). Since the late twentieth century, a set of modular educational resources developed and systematized under names such as the Ruhi materials (originating in Colombia in the 1970s and 1980s) have been widely used by local communities in many countries to teach scripture, cultivate spiritual qualities and train individuals for community service. These programs are typically administered by local institutions, translated into local languages and adapted to cultural contexts; adherents see this local‑level application as balancing universal scriptural norms with particular pedagogical strategies.
Contestation over authority has been a recurrent historical feature. From the earliest decades after the Báb’s execution in 1850, succession controversies occurred; a notable early claimant, known as Subh‑i‑Azal (Mírza Yahyá), represented an alternative center of authority opposed to Bahá'u'lláh’s claim in the late nineteenth century. In the twentieth century, smaller groups and individuals who disputed the legitimacy of the recognized institutions or of those occupying appointed or elected positions were labeled "Covenant‑breakers" in mainstream Bahá'í discourse; the mainstream community regards these schisms as breaches of the Covenant and documents them as part of its institutional history. Scholars of new religious movements commonly treat such episodes as familiar patterns in processes of succession and organizational consolidation, comparing them to analogous controversies in other religious traditions.
A further, ongoing tension within the tradition is the relationship between textual authority and democratic methods. While Bahá'í sacred texts and the interpretive role granted to specific figures are given high status by adherents, much of community governance depends on regular elections, collective consultation (shura), and the development of collective institutions. Comparative religion scholars frequently highlight this hybrid arrangement — a strong textual anchoring combined with participatory, elected administration — as an innovative model that seeks to reconcile claims of continuous revelation with modern institutional forms. At the same time, the practical life of the community is shaped by historical contingencies — for example, the impact of state restrictions and persecution in places such as Iran and varying degrees of legal recognition around the world — factors that have influenced methods of transmission, demographic distribution and institutional development. Estimates of the adherent population vary by source; scholars and demographic studies generally place membership in the millions, with presence in many dozens of countries, though precise figures and geographic distributions are contested and subject to differing methodologies.