Does the prayer become invalid if one follows the imam in a fifth rak'ah while knowing it is the fifth?
Machine translationRead the Arabic original
The questioner:
May Allah reward you, Honorable Shaykh. A questioner says: What is the ruling on following the imam in an extra fifth rak'ah in the Zuhr prayer, when he knows it is the fifth?
The Shaykh:
It is permissible for him to do so. If he knows it is the fifth, he should sit. If he wishes, he may conclude the prayer for himself; if he wishes, he may wait for them to conclude and conclude with them. Yes.
The questioner:
May Allah reward you, Honorable Shaykh. A questioner says: What is the ruling...
The Shaykh:
...following them while knowing it is the fifth? The prayer is invalid. Yes.
May Allah reward you, Honorable Shaykh. A questioner says: What is the ruling on following the imam in an extra fifth rak'ah in the Zuhr prayer, when he knows it is the fifth?
The Shaykh:
It is permissible for him to do so. If he knows it is the fifth, he should sit. If he wishes, he may conclude the prayer for himself; if he wishes, he may wait for them to conclude and conclude with them. Yes.
The questioner:
May Allah reward you, Honorable Shaykh. A questioner says: What is the ruling...
The Shaykh:
...following them while knowing it is the fifth? The prayer is invalid. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 756- هل تبطل الصلاة بمتابعة الإمام في ركعة خامسة مع العلم بها؟ - صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.