Is it obligatory to repeat the prayer if it is discovered after completion that the imam was not in a state of ritual purity?
Machine translationRead the Arabic original
Question:
May Allah reward you, Honorable Shaykh. This questioner says: If the imam leads a congregation in prayer, and after the prayer it becomes clear that he was not in a state of ritual purity, what is obligatory for the followers in this case?
Answer:
The followers owe nothing if they did not know, and the imam did not know until after the prayer; in that case, they owe nothing and their prayers are valid. As for the imam, he must perform ritual purity and repeat the prayer.
May Allah reward you, Honorable Shaykh. This questioner says: If the imam leads a congregation in prayer, and after the prayer it becomes clear that he was not in a state of ritual purity, what is obligatory for the followers in this case?
Answer:
The followers owe nothing if they did not know, and the imam did not know until after the prayer; in that case, they owe nothing and their prayers are valid. As for the imam, he must perform ritual purity and repeat the prayer.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/1416] هل تلزم إعادة الصلاة إذا تبين بعد الانتهاء أن الإمام لم يكن متوضئا؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.