The document discusses the Islamic concept of infallibility (ismah) which means those guided by Allah to lead others must be sinless. It states all prophets, Fatima, and the 12 imams were infallible and protected from sin by Allah. An infallible person (masum) is aware of sins and avoids them completely due to their knowledge of how sins harm the soul. The document argues prophets and imams must be infallible otherwise people would be confused about what teachings to follow since religious leaders could make mistakes. It provides the example of Ibrahim asking if his descendants would also be imams, and Allah replying only the unjust would be excluded, indicating an imam cannot