Explaining what is required of the followers if the imam stands for an extra rak'ah
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Q427: The questioner says: If the imam stands for an extra rak'ah, and some of the followers know that it is an extra rak'ah, but the imam has not noticed, should the follower remain in his tashahhud, or should he continue with the imam in this situation?
A427: If the imam stands for an extra rak'ah, and some of the followers know that it is extra, he should alert him by saying: Subhan Allah, Subhan Allah. If the imam does not return, he should remain sitting and not stand with him while knowing that it is extra. If he wishes, he may perform the final tashahhud and conclude the prayer on his own. If he wishes, he may perform the final tashahhud and wait until he concludes the prayer with the imam.
A427: If the imam stands for an extra rak'ah, and some of the followers know that it is extra, he should alert him by saying: Subhan Allah, Subhan Allah. If the imam does not return, he should remain sitting and not stand with him while knowing that it is extra. If he wishes, he may perform the final tashahhud and conclude the prayer on his own. If he wishes, he may perform the final tashahhud and wait until he concludes the prayer with the imam.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.