Please note: this fatwa has been translated by artificial intelligence.
Question
If it becomes clear to the people after some time that the Sheikh they were praying behind was not a Muslim, but a man who conceals his disbelief, what should they do? Is it obligatory for them to make up their prayers?
Answer
I say, and with God's help: There is a difference regarding the repetition of their prayers, and as long as their prayers are valid according to one of the jurisprudential schools, they are not required to repeat them; otherwise, it is obligatory. And God knows best.