A man prayed behind an imam, and the imam added a fifth rak'ah, so the ma'mum stood with him, ignorant of the ruling. What is the ruling on his prayer?
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Question:
He says: Honorable Shaykh, may Allah grant you success. A man prayed behind an imam, and the imam added a fifth rak'ah, so this ma'mum stood with him, knowing it was the fifth, but ignorant of the ruling. What is required of him? Is his prayer valid?
Answer:
If he is ignorant of the ruling, his prayer is valid. But if he followed him knowing it was an extra rak'ah and knowing the ruling, his prayer is invalid; because he added to the prayer intentionally. Yes.
He says: Honorable Shaykh, may Allah grant you success. A man prayed behind an imam, and the imam added a fifth rak'ah, so this ma'mum stood with him, knowing it was the fifth, but ignorant of the ruling. What is required of him? Is his prayer valid?
Answer:
If he is ignorant of the ruling, his prayer is valid. But if he followed him knowing it was an extra rak'ah and knowing the ruling, his prayer is invalid; because he added to the prayer intentionally. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [860 -1024] رجل صلى خلف إمام فزاد الإمام ركعة خامسة، فقام معه المأموم جاهلا بالحكم، فما حكم صلاته؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.