What is the ruling on one who misses a rak'ah of his prayer out of forgetfulness and concludes the prayer thinking he has completed it?
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Question:
A man prayed the Fajr rawatib beside me, but he only prayed one rak'ah because he was sleepy. After I finished my prayer, I informed him that he had only prayed one rak'ah and asked me whether he should come and pray a second rak'ah and perform the prostration for forgetfulness, or whether he should repeat the Fajr rawatib as two rak'ahs. What is the correct ruling?
Answer:
If the time is still close and you alerted him, and only a short time has passed, he should stand up, pray the second rak'ah, and perform the prostration for forgetfulness.
A man prayed the Fajr rawatib beside me, but he only prayed one rak'ah because he was sleepy. After I finished my prayer, I informed him that he had only prayed one rak'ah and asked me whether he should come and pray a second rak'ah and perform the prostration for forgetfulness, or whether he should repeat the Fajr rawatib as two rak'ahs. What is the correct ruling?
Answer:
If the time is still close and you alerted him, and only a short time has passed, he should stand up, pray the second rak'ah, and perform the prostration for forgetfulness.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما حكم من نقص ركعة من صلاته سهوا، وسلم ظنا منه أنه أتم صلاته؟ للشيخ الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.