What is the ruling on one who forgets in his prayer and intentionally leaves out the prostration for forgetfulness?
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Question:
He says: Honorable Shaykh, may Allah grant you success, if the prostration for forgetfulness is obligatory for the one praying, what is the ruling on one who leaves it out intentionally or by mistake?
Answer:
If he leaves it out intentionally, his prayer is not valid, because he left it out. There is a difference between the prostration for a deficiency and this. If he leaves it out intentionally, his prayer is invalid because it is a means of completion. But if he leaves out the prostration for an addition, which is after the taslim, his prayer is not invalid. Yes.
He says: Honorable Shaykh, may Allah grant you success, if the prostration for forgetfulness is obligatory for the one praying, what is the ruling on one who leaves it out intentionally or by mistake?
Answer:
If he leaves it out intentionally, his prayer is not valid, because he left it out. There is a difference between the prostration for a deficiency and this. If he leaves it out intentionally, his prayer is invalid because it is a means of completion. But if he leaves out the prostration for an addition, which is after the taslim, his prayer is not invalid. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [328 -2802] ما حكم من سها في صلاته وترك سجود السهو عمدا؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.