Key figures: Abu Yazid al-Bistami (~804–874 AD) — ‘Glory be to me, how great is my glory!’ (shath/ecstatic utterance); Al-Hallaj (~858–922 AD) — ‘I am the Truth’; Junayd of Baghdad (~830–910 AD) — the ‘sober’ Sufi alternative; Ibn Arabi (~1165–1240 AD) — Wahdat al-Wujud (Unity of Being).

Fana (annihilation) is the Sufi doctrine that the highest stage of the mystical path involves the dissolution of the individual self (nafs) in the divine presence — not the annihilation of the person’s existence, but the annihilation of their separate ego-consciousness. What remains is baqa (subsistence in God). In this state, mystics have reported experiences expressed in ‘scandalous’ language that sounds like claims to divinity — al-Bistami’s ‘Glory be to me!’ and al-Hallaj’s ‘I am the Truth’ are the most famous. The Sufi mainstream (represented by Junayd) insisted on a ‘sober’ mysticism that maintained the Creator-creature distinction even in the highest states of union. The ‘drunk’ mysticism of Bistami and Hallaj pushed against this boundary. Ibn Arabi’s Wahdat al-Wujud (‘Unity of Being’) — the claim that all existence is one, with no ultimate distinction between Creator and creation — represents the philosophical elaboration of fana theology and was condemned by Ibn Taymiyya and Wahhabism as pantheism and shirk.