What do the followers do if the imam’s ablution is invalidated during the prayer?
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Question:
May Allah reward you, Honorable Shaykh. This questioner says: An imam prayed with the people, and during the prayer he remembered that he was not in a state of ritual purity, so he left. The question is: Do the followers have to repeat the prayer, or should they complete their prayer?
Answer:
If they wish, they can wait until he performs ablution, comes back, and prays with them. If they wish, they can appoint one of them to lead them, and he starts the prayer anew. They appoint one to lead them, if they are not waiting for the imam. Yes.
May Allah reward you, Honorable Shaykh. This questioner says: An imam prayed with the people, and during the prayer he remembered that he was not in a state of ritual purity, so he left. The question is: Do the followers have to repeat the prayer, or should they complete their prayer?
Answer:
If they wish, they can wait until he performs ablution, comes back, and prays with them. If they wish, they can appoint one of them to lead them, and he starts the prayer anew. They appoint one to lead them, if they are not waiting for the imam. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/1475] ماذا يفعل المأمومون إذا انتقض وضوء الإمام أثناء الصلاة؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.