The ruling on the prayer of one who prays alone behind the rows
Machine translationRead the Arabic original
Question:
Shaykh, if a person praying alone stands behind the rows, and then someone comes and joins him in the second rak'ah, is it permissible for him to repeat the entire prayer if he is informed after the taslim that the prayer of the person praying alone behind the rows is invalid?
Answer:
If he joined him before the prostration, his state of praying alone is rectified, and they become two, and there is no harm in that. However, if he prayed a complete rak'ah and no one joined him, his prayer is invalid, and it is not permissible for anyone to form a row with him. Yes.
Shaykh, if a person praying alone stands behind the rows, and then someone comes and joins him in the second rak'ah, is it permissible for him to repeat the entire prayer if he is informed after the taslim that the prayer of the person praying alone behind the rows is invalid?
Answer:
If he joined him before the prostration, his state of praying alone is rectified, and they become two, and there is no harm in that. However, if he prayed a complete rak'ah and no one joined him, his prayer is invalid, and it is not permissible for anyone to form a row with him. Yes.
Source
نور على الدرب - الفوزان - 02/267 — archive.org (14:57)
The Arabic text is a machine transcription of the audio recording.