What is the ruling on the prayer of the Imam and the congregants if the Imam made a mistake in the 'Isha prayer and sat for the final Tashahhud in the third rak'ah, and one of the congregants alerted him by saying "SubhanAllah," so he thought he had forgotten a prostration and performed it, then the congregant alerted him that there was a missing rak'ah, so he stood up and performed it, completing the fourth rak'ah and prostrating for forgetfulness before the Tasleem?
Increasing an act of the same kind as prayer out of forgetfulness is compensated for by the prostration of forgetfulness (sujud sahwi). However, if the congregant (ma'mum) speaks out of ignorance or forgetfulness during prayer, it does not affect its validity if it is minor, based on the hadith of Mu'awiyah ibn al-Hakam al-Sulami and the hadith of Dhul-Yadayn. Therefore, your prayer is valid, and you do not need to repeat it.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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