An imam is guilty of some secret sin; should he continue in his position as imam?

If the one who knows more Qur’an holds Ash’ari beliefs, can he still lead the prayer?

Can a woman lead prayer if she knows more Qur’aan?

Adding another rak’ah to the imam’s witr because one wants to pray some more

Non-circumcised man leading prayers

Imam for sisters praying in congregation

Rejecting the sunnah and praying behind someone who does