The ma'mum who is behind by one rak'ah, and the imam prostrates for forgetfulness after the taslim: does the ma'mum follow him?
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Question:
May Allah reward you, Your Eminence, father. The questioner says: If the ma'mum is behind by one rak'ah and joins the congregation, and when the imam says the taslim he prostrates for forgetfulness after the taslim, does the ma'mum in this situation prostrate, or does he perform the rak'ah he is behind by and then prostrate?
Answer:
No, he does not stand up until he prostrates with the imam. They say that if he stands up before prostrating with the imam, his prayer becomes a voluntary prayer. So he does not stand up until the imam has finished the prayer. The Messenger (peace and blessings be upon him) said: "The imam is made to be followed." So as long as he has not finished the prayer, it is not permissible for you to stand up. Yes.
May Allah reward you, Your Eminence, father. The questioner says: If the ma'mum is behind by one rak'ah and joins the congregation, and when the imam says the taslim he prostrates for forgetfulness after the taslim, does the ma'mum in this situation prostrate, or does he perform the rak'ah he is behind by and then prostrate?
Answer:
No, he does not stand up until he prostrates with the imam. They say that if he stands up before prostrating with the imam, his prayer becomes a voluntary prayer. So he does not stand up until the imam has finished the prayer. The Messenger (peace and blessings be upon him) said: "The imam is made to be followed." So as long as he has not finished the prayer, it is not permissible for you to stand up. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [900 -1024] المأموم إذا كان مسبوقا بركعة، وسجد الإمام للسهو بعد السلام، فهل يتابعه المأموم؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.