Is it prescribed for the ma'mum, if the imam forgets the prostration, for the ma'mum to recite, for example, the words of Allah the Exalted: (And be among those who prostrate)?
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Question:
Honorable Shaykh, may Allah grant you success. The questioner asks: Is reminding the imam with words that are in the interest of the prayer permissible? So I say to him, if he forgets the prostration, "And be among those who prostrate." Is this a prescribed matter?
Answer:
If you recite from the Qur'an, there is nothing wrong with it. But if you recite words other than the Qur'an, it is not permissible. Yes.
Honorable Shaykh, may Allah grant you success. The questioner asks: Is reminding the imam with words that are in the interest of the prayer permissible? So I say to him, if he forgets the prostration, "And be among those who prostrate." Is this a prescribed matter?
Answer:
If you recite from the Qur'an, there is nothing wrong with it. But if you recite words other than the Qur'an, it is not permissible. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [2707 -3022] هل يشرع للمأموم إذا نسي الإمام السجود أن يقرأ المأموم مثلا قوله تعالى(وكن من الساجدين)؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.