“Ismah” means being protected from sin and error — a quality Shia Islam attributes to Prophet Muhammad, his daughter Fatima al-Zahra, and each of the Twelve Imams. It’s why these fourteen figures together are known as “the Infallibles” (ma’sumin).
Where the Word Comes From
Ismah comes from the Arabic root ‘a-s-m, meaning to hold onto or protect. An ‘asim is one who protects; a ma’sum is someone who has been protected — in this case, protected from sin and error. This is the same root behind “the Fourteen Infallibles” (chahardah ma’sum), the very concept this platform’s name draws on.
What Does Infallibility Actually Mean?
Infallibility does not mean these fourteen people were somehow not ordinary human beings, or that they were spared pain, illness, and death — every one of them lived a real human life: they ate, fell ill, and eventually died like anyone else. Infallibility concerns one specific thing: being protected from intentional sin, and from error in receiving and conveying religious teaching. In practice, this means that when the Prophet recited a verse of the Qur’an, or an Imam explained a point of religious law, Shia belief holds that what has reached us is free of mistake or sin in that act of transmission.
Why Does This Belief Matter?
The reasoning behind it is fairly direct: if someone is meant to serve as the final authority for understanding religion correctly — the role described in the companion post on what imamate means — then their word needs to be something people can trust completely. Otherwise, there would be no reliable way to know which parts of what they said were accurate and which weren’t.
Do All Muslims Share This Belief?
No. Infallibility on this scale, applied to the Imams, is a distinctly Shia belief. In Sunni thought, infallibility is generally attributed only to the prophets, and even then mainly with respect to conveying revelation rather than covering every aspect of personal life — not to religious leaders after the Prophet. Even within the broader Islamic tradition, scholars have long disagreed about exactly how far a prophet’s infallibility extends — for instance, whether it covers unintentional mistakes in everyday matters. Rather than glossing over these disagreements, this platform states them plainly.
Sources
- Moojan Momen, An Introduction to Shi’i Islam, Yale University Press, 1985.
- Wilferd Madelung, “ʿEṢMAT,” Encyclopædia Iranica.
- Sayyed Muhammad Husayn Tabataba’i, Shi’ite Islam, trans. Seyyed Hossein Nasr (section on the infallibility of the Imams).
Related reading: see “What Does Imamate Mean in Shia Islam?” and the Fourteen Infallibles landing page on Noorjoo.