One who prayed Maghrib and then went to a mosque where they had not yet prayed: does he repeat the prayer with them?
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Question:
He says: Honorable Shaykh, may Allah grant you success, if one prayed Maghrib and then went to a mosque where they had not yet prayed, does he repeat the prayer with them?
Answer:
If the iqamah is present, he prays with them, but he makes it four rak'ahs. When he says the taslim, he stands up and completes the fourth, which becomes a voluntary prayer for him. Yes. As for if he arrives while they are praying, no, he does not join them. He does not join them unless the iqamah is present. Yes.
He says: Honorable Shaykh, may Allah grant you success, if one prayed Maghrib and then went to a mosque where they had not yet prayed, does he repeat the prayer with them?
Answer:
If the iqamah is present, he prays with them, but he makes it four rak'ahs. When he says the taslim, he stands up and completes the fourth, which becomes a voluntary prayer for him. Yes. As for if he arrives while they are praying, no, he does not join them. He does not join them unless the iqamah is present. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [177 /641] من صلى المغرب ثم أتى إلى مسجد لم يصلوا بعد، فهل يعيد الصلاة معهم؟ الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.