The Ruling on the Prostration for Forgetfulness When an Extra Rak'ah Is Added
Machine translationRead the Arabic original
Question:
The questioner says: Shaykh Salih, if the imam is praying the midday prayer and he adds a fifth rak'ah, does he prostrate for forgetfulness before the closing salam or after the closing salam?
Answer:
He prostrates after the closing salam. It is permissible to prostrate before the closing salam, and it is permissible to prostrate after the closing salam. However, the preferred practice is that if the prostration is due to an addition in the prayer, it is better to do it after the closing salam. As for if the prostration is due to a deficiency in the prayer, it is better to do it before the closing salam. Yes.
The questioner says: Shaykh Salih, if the imam is praying the midday prayer and he adds a fifth rak'ah, does he prostrate for forgetfulness before the closing salam or after the closing salam?
Answer:
He prostrates after the closing salam. It is permissible to prostrate before the closing salam, and it is permissible to prostrate after the closing salam. However, the preferred practice is that if the prostration is due to an addition in the prayer, it is better to do it after the closing salam. As for if the prostration is due to a deficiency in the prayer, it is better to do it before the closing salam. Yes.
Source
نور على الدرب - الفوزان - 03/106 — archive.org (9:42)
The Arabic text is a machine transcription of the audio recording.