What is the ruling on praying the 'Asr prayer behind someone who is praying the Maghrib prayer?
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Question:
If the Maghrib prayer is being performed with the congregation, should I join them with the intention of praying 'Asr, or should I pray Maghrib with them?
Answer:
If you arrive and they are praying Maghrib, and you have not prayed 'Asr, you have a choice. If you wish, you may pray 'Asr first, then join them in the remainder of the Maghrib prayer. If you wish, you may join them with the intention of Maghrib; when the imam concludes the third rak'ah, you stand up and perform the fourth rak'ah and conclude the prayer.
If the Maghrib prayer is being performed with the congregation, should I join them with the intention of praying 'Asr, or should I pray Maghrib with them?
Answer:
If you arrive and they are praying Maghrib, and you have not prayed 'Asr, you have a choice. If you wish, you may pray 'Asr first, then join them in the remainder of the Maghrib prayer. If you wish, you may join them with the intention of Maghrib; when the imam concludes the third rak'ah, you stand up and perform the fourth rak'ah and conclude the prayer.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما حكم صلاة العصر خلف من يصلي المغرب؟ للشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.