He was not sure whether he had said the opening takbir, so he repeated it; was the prayer of those who were praying behind him rendered invalid?

The imam made a mistake in the intention for the prayer, so he interrupted the prayer and said the opening takbir again, but the people praying behind him were not aware of that

Is it permissible for the imam to tell those who are praying behind him to switch off their mobile phones when straightening the rows for the prayer?

The imam got up for a third [rak‘ah] in Taraweeh, then added another [rak‘ah] to it, but there was someone behind him who was praying ‘Isha’

Ruling on a woman who leads her relatives in praying Taraweeh when she is menstruating, and ruling on the prayer of those who prayed behind her

He prayed behind an apostate imam for five years and was aware of his apostasy

They prayed behind someone who did not say the takbeer and tasleem out loud; what is the ruling on their prayer?

Ruling on leading of the prayer by one who cannot recite al-Fatihah well

He decided (and formed the intention) to carry on praying on his own because the sound of the imam’s voice was cut off, then the sound was restored, and he found that he had gone ahead of his imam in the prayer. What is the ruling?

Ruling on praying behind someone who promotes democracy and secularism