A man prayed behind the row alone, then after the second rak'ah another man joined him in the row. What is the ruling on the first rak'ah?
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Question:
Honorable Shaykh, may Allah grant you success, he says: If a person prays behind the row alone, and then after the second rak'ah another person comes and joins him, does his entire prayer become invalid?
Answer:
Yes, if he prays a complete rak'ah alone—bowing and prostrating—and no one comes, his prayer is invalid. However, if another person joins him before he prostrates, the condition of being alone is removed and his prayer is valid. Yes.
Honorable Shaykh, may Allah grant you success, he says: If a person prays behind the row alone, and then after the second rak'ah another person comes and joins him, does his entire prayer become invalid?
Answer:
Yes, if he prays a complete rak'ah alone—bowing and prostrating—and no one comes, his prayer is invalid. However, if another person joins him before he prostrates, the condition of being alone is removed and his prayer is valid. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [539 -582] صلى رجل خلف الصف وحده، ثم بعد الركعة الثانية صف معه آخر، ما حكم الركعة الأولى؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.