What is the ruling on one who enters the mosque intending to pray the Maghrib prayer and finds them in the second rak'ah of the 'Isha' prayer?
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Question:
A man entered the mosque intending to pray the Maghrib prayer, and found them praying the 'Isha' prayer. He joined them in the second rak'ah. Does he complete the rest of the prayer with them, and does it count as his Maghrib prayer?
Answer:
Yes, it is permissible to pray the Maghrib prayer behind one who is praying the 'Isha' prayer, and the reverse is also permissible. This is praying one prayer behind another, but one must not exceed three rak'ahs. Yes.
A man entered the mosque intending to pray the Maghrib prayer, and found them praying the 'Isha' prayer. He joined them in the second rak'ah. Does he complete the rest of the prayer with them, and does it count as his Maghrib prayer?
Answer:
Yes, it is permissible to pray the Maghrib prayer behind one who is praying the 'Isha' prayer, and the reverse is also permissible. This is praying one prayer behind another, but one must not exceed three rak'ahs. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما حكم من دخل المسجد يُريد يُصلي صلاة المغرب ووجدهم في الركعة الثانية من صلاة العشاء؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.