Infallibility is a spiritual power and inner virtue that restrains one from even imagining and thinking of sinning, let alone committing sin and in Islamic terms, means for one to be protected from sin, mistake and forgetfulness.

Infallibility can be divided into two general groups of: 1- Absolute infallibility 2- Proportional infallibility, which can get different in strength and weakness.

According to this categorization, five groups of people can be called infallible:

1- All of Allah’s (swt) prophets

2- All of the imams

3- All of Allah’s (swt) angels

4- Those other than the abovementioned (because being an infallible doesn’t necessarily mean that one is a prophet or imam) such as Lady Fatimah (as) or Lady Maryam (as).

5- A group of ordinary purified people other than those mentioned above.