The imam bowed, and the one praying behind him went down to prostrate in forgetfulness, not realizing it until after the imam had risen from the bowing. What is the ruling?
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Question:
Honorable Shaykh, may Allah grant you success. The questioner says: I prayed with the imam, and in the third rak'ah, the imam bowed, so I went down to prostrate and did not realize what I was doing. Then I stood up to bow with him, but he had already risen from the bowing. What is obligatory for you?
Answer:
Bow after him. If you stand up and bow after him, then catch up with him, and your first action is considered a mistake. Yes.
Honorable Shaykh, may Allah grant you success. The questioner says: I prayed with the imam, and in the third rak'ah, the imam bowed, so I went down to prostrate and did not realize what I was doing. Then I stood up to bow with him, but he had already risen from the bowing. What is obligatory for you?
Answer:
Bow after him. If you stand up and bow after him, then catch up with him, and your first action is considered a mistake. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [2863 -3022] ركع الإمام فنزل المأموم للسجود ناسيا ولم ينتبه إلا بعد قيام الإمام من الركوع فما الحكم؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.