The imam led the people in the 'Asr prayer for three rak'ahs, and none of the ma'mum (those praying behind the imam) alerted him until the Maghrib prayer
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Question:
He says: Honorable Shaykh, may Allah grant you success, the imam led the people in the 'Asr prayer for three rak'ahs, and none of the ma'mum alerted him until the Maghrib prayer, when one of them alerted him. What is obligatory in this case?
Answer:
It is obligatory to repeat the prayer because it is incomplete, so it must be repeated, and one should hasten to repeat it. Yes.
He says: Honorable Shaykh, may Allah grant you success, the imam led the people in the 'Asr prayer for three rak'ahs, and none of the ma'mum alerted him until the Maghrib prayer, when one of them alerted him. What is obligatory in this case?
Answer:
It is obligatory to repeat the prayer because it is incomplete, so it must be repeated, and one should hasten to repeat it. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [1067 /1350] صلى إمام بالناس صلاة العصر ثلاث ركعات، ولم ينبهه أحد من المأمومين حتى صلاة المغرب.. — youtube.com
The Arabic text is a machine transcription of the audio recording.