What is the ruling on the prayer of the imam and the ma'mum if the imam remembers that he is in a state of ritual impurity, and what is the ruling if he remembers after the taslim?
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The questioner:
We say: Honorable Shaykh, may Allah grant you success, if the imam prays while in a state of ritual impurity and becomes aware of the impurity during the prayer, what is the ruling on his prayer, and what is the ruling on the prayer of the ma'mum?
The Shaykh:
He must leave; it is obligatory for him to leave and replace himself with someone. Either he performs wudu' and returns to the ma'mum, or he appoints someone to lead them in prayer. However, he must not continue while in a state of ritual impurity; this is not permissible. Yes.
The questioner:
And what is the ruling if he did not become aware of it until after the completion of the prayer?
The Shaykh:
The ruling is that their prayer is valid, and he must repeat the prayer. He performs wudu' and repeats the prayer. Yes.
We say: Honorable Shaykh, may Allah grant you success, if the imam prays while in a state of ritual impurity and becomes aware of the impurity during the prayer, what is the ruling on his prayer, and what is the ruling on the prayer of the ma'mum?
The Shaykh:
He must leave; it is obligatory for him to leave and replace himself with someone. Either he performs wudu' and returns to the ma'mum, or he appoints someone to lead them in prayer. However, he must not continue while in a state of ritual impurity; this is not permissible. Yes.
The questioner:
And what is the ruling if he did not become aware of it until after the completion of the prayer?
The Shaykh:
The ruling is that their prayer is valid, and he must repeat the prayer. He performs wudu' and repeats the prayer. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [234 -1024] ما حكم صلاة الإمام والمأموم إذا تذكر الإمام أنه محدث وما الحكم إذا تذكر بعد السلام؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.