Protection from error is a claim about the reliability of a channel. If the Imams are preserved from error then what they said carries the same weight as what the Prophet said, and the corpus of their reported sayings becomes a source of law alongside the Quran and the Sunnah. Twelver jurisprudence rests on exactly that, and the Jafari school's independence from the Sunni schools follows from it more than from any single ruling. Ismaili doctrine holds the same of its Imams, with the difference that the line is not closed, so the protected authority is present rather than remembered. Zaydi doctrine does not extend it: an imam is a qualified descendant of Ali who rises and rules, and he may be mistaken. Sunni theology denies the claim entirely, holding that the Prophet's protection was particular to prophecy and that the community's scholars are fallible men whose errors are corrected by other men.
Facts
Origins
Held ByTwelver Shia Islam, whose jurisprudence rests on it, and Ismaili doctrine, which holds the same of its Imams with the difference that the line is not closed, so the protected authority is present rather than remembered. 1 Origin of the NameArabic isma, protection or preservation. 1Tradition: Arabic Position Profile
Opposing PositionZaydi doctrine does not extend it, holding that an imam is a qualified descendant of Ali who rises and rules and may be mistaken. Sunni theology denies it entirely, holding the Prophet's protection particular to prophecy and the community's scholars fallible men whose errors are corrected by other men. 1 The Claim
The ClaimIsmah, the doctrine that the Prophet Muhammad and, in Twelver Shi'i belief, the twelve Imams were protected from sin and error, underwrites the authority Shi'i tradition gives to the Imams' own teaching and example. 1 Status
Status Within the TraditionDefined and binding within this tradition 1Tradition: Shia (Twelver) Status Within the TraditionRejected, or not held, within this tradition 1Tradition: Sunni Doctrinal Category Attestation
Meaning in the Attesting SourceA claim about the reliability of a channel. If the Imams are preserved from error then what they said carries the weight of what the Prophet said, and the corpus of their reported sayings becomes a source of law alongside the Quran and the Sunnah. 1 Learn More
What Protection From Error Licenses as Evidence
What protection from error actually licenses is a change in what counts as evidence. A legal system that treats its jurists as fallible has to weigh a scholar's report against other reports and against the possibility he erred; a system that holds its central authorities incapable of error can instead treat their sayings as directly binding, the way a Quranic verse or a hadith of the Prophet is binding, which is why Twelver jurisprudence developed an entire second corpus, the collected sayings of the twelve Imams, standing beside the Prophet's own hadith as a source of law rather than as commentary on it.
Zaydi doctrine, built around a different model of leadership, never made that move. A Zaydi imam is a qualified descendant of Ali who rises openly, gathers support and rules, a role defined by action and recognized qualification rather than by an inherited, protected status, and Zaydi jurisprudence accordingly treats an imam's individual rulings as subject to correction like any other scholar's. The difference is not a matter of degree, more or less deference to a respected leader, but a difference in what kind of thing an imam's statement is taken to be: a fallible legal opinion in one tradition, a source of law itself in the other.
Cross-Tradition Connections
Belongs to Tradition
Alevi teaching venerates the Twelve Imams and holds them free of error, though Alevi religious life is organised around the dede lineages and the cem rather than around a class of jurists.
Ismaili doctrine holds the Imam protected from error, and because the line has not ended the protected authority is present rather than remembered.
Jafari law takes the sayings and acts of the twelve Imams as binding alongside the Prophet's, which follows directly from holding them protected from error.
The twelve Imams are held preserved from sin and from error, which is what makes their reported sayings a source of law alongside the Prophet's.
Critiqued By
Kharijites, Denominations Kharijite doctrine denied any hereditary or protected leadership, holding that the imamate belongs to the most pious Muslim whoever he is and lapses the moment he sins gravely.
Zaidiyyah, Denominations Zaydi doctrine does not hold the imams protected from sin or error, which separates it from Twelver and Ismaili Shiism while leaving the imamate in the line of Ali.
Opposed By
Ashari theology denies that any figure after the prophets is protected from sin and error.
Ibadism, Denominations Ibadi doctrine denies that the imam is protected from sin or error. The imam is elected on qualification, is answerable, and may be deposed, which is the Ibadi position against both the Sunni caliphate and the Shia imamate.
Sunni, Denominations Sunni Islam denies that any figure after the prophets is protected from sin and error, and with it the ground on which the Imams' reported sayings would be a source of law.
Sources
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