What is the ruling if only some followers are aware that the Imam was impure during the prayer?
Chapter on Praying with Impurity and Other Matters
Al-Mughni
Book of Prayer
Primary text
The established ruling is that the prayer of everyone is invalidated if some followers become aware of the Imam's impurity while others remain ignorant. However, the preferred opinion is that the invalidation should be restricted only to those who gained knowledge, as the invalidating factor is specific to them, analogous to the invalidation caused by the Imam's own impurity, which is specific to him.