The one who joins the prayer late when the imam stands for an extra rak'ah
Machine translationRead the Arabic original
Question:
The questioner says: Honorable Shaykh, may Allah preserve you. A man missed one rak'ah and caught up with the imam for three rak'ahs, but the imam stood up for the fifth. So he stood up with him and said the taslim with him. Is his prayer valid?
Answer:
He stood up for the fifth as an addition due to forgetfulness. That means the imam stood up for a fifth rak'ah out of forgetfulness, so the addition is not counted; it is not taken into account. The one who joins the prayer late does not count the addition because it is idle talk; this addition is idle talk, not prayer. So the one who joins late does not count it, but he makes up for it with one rak'ah. Yes. And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.
The questioner says: Honorable Shaykh, may Allah preserve you. A man missed one rak'ah and caught up with the imam for three rak'ahs, but the imam stood up for the fifth. So he stood up with him and said the taslim with him. Is his prayer valid?
Answer:
He stood up for the fifth as an addition due to forgetfulness. That means the imam stood up for a fifth rak'ah out of forgetfulness, so the addition is not counted; it is not taken into account. The one who joins the prayer late does not count the addition because it is idle talk; this addition is idle talk, not prayer. So the one who joins late does not count it, but he makes up for it with one rak'ah. Yes. And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.
Source
الفوزان -أشرطة- شرح زاد المستقنع مع الأسئلة - 056-باب الحجر - الوكالة - 13-10-23 هـ — archive.org (34:35)
The Arabic text is a machine transcription of the audio recording.