I prayed 'Asr and forgot the last prostration, and someone reminded me, so I performed the missing prostration!
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Question:
Honorable Shaykh, may Allah grant you success. I prayed 'Asr shortened while traveling and forgot the last prostration, then I said the closing salam. One of the people praying behind me reminded me, so I performed the missing prostration and prostrated for forgetfulness. Is my action correct? You perform the prostration and whatever comes after it. What comes after it? You perform only the prostration and then say the salam.
Answer:
No, and whatever comes after it. If it was the last prostration, then what comes after it is the final tashahhud, so you repeat it a second time, because your state with it initially was not valid. So you perform the prostration, then you perform the final tashahhud, then you say the salam, and you prostrate for forgetfulness. Yes.
Honorable Shaykh, may Allah grant you success. I prayed 'Asr shortened while traveling and forgot the last prostration, then I said the closing salam. One of the people praying behind me reminded me, so I performed the missing prostration and prostrated for forgetfulness. Is my action correct? You perform the prostration and whatever comes after it. What comes after it? You perform only the prostration and then say the salam.
Answer:
No, and whatever comes after it. If it was the last prostration, then what comes after it is the final tashahhud, so you repeat it a second time, because your state with it initially was not valid. So you perform the prostration, then you perform the final tashahhud, then you say the salam, and you prostrate for forgetfulness. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [104 /641] صليت العصر ونسيت السجدة الأخيرة، ونبهني أحدهم ثم أتيت بالسجدة الناقصة! الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.