What is the ruling on one who forgets the bowing and remembers it during prostration?
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The questioner : A questioner says: I prayed with the imam of Abu Ayyah, and when [the recording is garbled]...
The Shaykh : Yes. From every page, there is a question. Yes.
The questioner : And when the imam sent [the recording is garbled], I stood up and prayed.
The Shaykh : Let’s go down.
The questioner : He says: I prayed with the imam, or rather, when the imam prostrated, I stood up and prayed the next [rak'ah], except that I forgot the bowing and did not remember it until after the prostration. So, is the prostration for forgetfulness obligatory on me?
The Shaykh : If the one praying remembers that he forgot the bowing while he is in prostration, it is obligatory for him to stand up from his prostration, then complete his recitation if it was not completed, then bow, then complete his prayer and say the closing salam, then prostrate two prostrations after the salam. For each prostration, he says the takbir when prostrating and when rising. I will know and say: It is not befitting for a person to pray alone while people are praying in congregation. If he wants to pray with the imam, he does not pray alone.
The Shaykh : Yes. From every page, there is a question. Yes.
The questioner : And when the imam sent [the recording is garbled], I stood up and prayed.
The Shaykh : Let’s go down.
The questioner : He says: I prayed with the imam, or rather, when the imam prostrated, I stood up and prayed the next [rak'ah], except that I forgot the bowing and did not remember it until after the prostration. So, is the prostration for forgetfulness obligatory on me?
The Shaykh : If the one praying remembers that he forgot the bowing while he is in prostration, it is obligatory for him to stand up from his prostration, then complete his recitation if it was not completed, then bow, then complete his prayer and say the closing salam, then prostrate two prostrations after the salam. For each prostration, he says the takbir when prostrating and when rising. I will know and say: It is not befitting for a person to pray alone while people are praying in congregation. If he wants to pray with the imam, he does not pray alone.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 12 - 13 - دروس وفتاوى المسجد الحرام للعام 1402 هـ - الدرس الثاني عشر - الشيخ محمد بن صالح العثيمين — youtube.com (55:25)
The Arabic text is a machine transcription of the audio recording.