The ruling on one who leads people in prayer without being in a state of ritual purity
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Q368: The questioner says: A man led people in one of the obligatory prayers, and after they finished the prayer and dispersed, he remembered that he was not in a state of ritual purity. He then repeated the prayer alone after performing wudu. Is the prayer of the followers behind him valid, or is he required to inform the followers who prayed behind him?
Vol. 368: The prayer of the followers in this case is valid, if he prayed with them and it became clear to him after completing the prayer that he was not in a state of ablution; their prayer is valid, but he must repeat the prayer. This is something that happened to the Commander of the Faithful, 'Umar ibn al-Khattab (may Allah be pleased with him), for he led the people in the Fajr prayer, and when he had prayed, it became clear to him that he was not in a state of ritual purity, so he performed the purification (may Allah be pleased with him) and repeated the prayer, and he did not order the followers to repeat the prayer.
Vol. 368: The prayer of the followers in this case is valid, if he prayed with them and it became clear to him after completing the prayer that he was not in a state of ablution; their prayer is valid, but he must repeat the prayer. This is something that happened to the Commander of the Faithful, 'Umar ibn al-Khattab (may Allah be pleased with him), for he led the people in the Fajr prayer, and when he had prayed, it became clear to him that he was not in a state of ritual purity, so he performed the purification (may Allah be pleased with him) and repeated the prayer, and he did not order the followers to repeat the prayer.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.