What is the ruling on a latecomer who made a mistake in the number of rak'ahs he missed and did not remember until after the time for prayer had ended?
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Question:
He entered the prayer, he says, and he was behind the imam, meaning he was a latecomer. He says he was behind the imam by two rak'ahs. When the imam said the taslim, he stood up and prayed one rak'ah, and he forgot that he had missed two rak'ahs, and he did not remember until after the time for prayer had ended. So what is required of him?
Answer:
He repeats the prayer from the beginning. Yes.
He entered the prayer, he says, and he was behind the imam, meaning he was a latecomer. He says he was behind the imam by two rak'ahs. When the imam said the taslim, he stood up and prayed one rak'ah, and he forgot that he had missed two rak'ahs, and he did not remember until after the time for prayer had ended. So what is required of him?
Answer:
He repeats the prayer from the beginning. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما حكم المسبوق الذي أخطأ في عدد ركعات ما فاته ولم يتذكر إلا بعد خروج وقت الصلاة؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.