What is the ruling on a ma'mum who forgets the final tashahhud in the prayer?
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Question:
A questioner says: If the ma'mum forgets to recite the final tashahhud and the prayer upon the Prophet (peace and blessings be upon him), what should he do?
Answer:
If the ma'mum forgets the final tashahhud and the prayer upon the Prophet (peace and blessings be upon him)—the final one, not the first tashahhud—it is a pillar of the prayer and is obligatory. He performs it after the imam has said the taslim. If the imam has said the taslim and he did not perform the final tashahhud, he delays and performs the final tashahhud, then says the taslim, because it is a pillar. As for the first tashahhud, sujud al-sahw is obligatory in it; this is one of the obligations of the prayer, and sujud al-sahw is performed. There is no sujud for a ma'mum except in following his imam, sujud al-sahw. Yes.
A questioner says: If the ma'mum forgets to recite the final tashahhud and the prayer upon the Prophet (peace and blessings be upon him), what should he do?
Answer:
If the ma'mum forgets the final tashahhud and the prayer upon the Prophet (peace and blessings be upon him)—the final one, not the first tashahhud—it is a pillar of the prayer and is obligatory. He performs it after the imam has said the taslim. If the imam has said the taslim and he did not perform the final tashahhud, he delays and performs the final tashahhud, then says the taslim, because it is a pillar. As for the first tashahhud, sujud al-sahw is obligatory in it; this is one of the obligations of the prayer, and sujud al-sahw is performed. There is no sujud for a ma'mum except in following his imam, sujud al-sahw. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما حكم المأموم الذي نسي التشهد الأخير في الصلاة؟ لمعالي الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.