What should one do if he forgets the 'Asr prayer and does not remember it until he is in the Maghrib prayer?
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Question:
May Allah reward you, Your Eminence, father. The questioner says: A man forgot the 'Asr prayer and did not remember it until he was praying Maghrib in congregation behind the imam. What is required of him?
Answer:
He is required to leave the Maghrib prayer and pray 'Asr first, then pray Maghrib afterwards, because the order is obligatory, and he remembered it before he had finished the Maghrib prayer. However, if he had finished the Maghrib prayer and did not remember it until after he had said the taslim of Maghrib, he would pray 'Asr, and the order would be dropped due to his forgetfulness. But here, he remembered it while he was praying. So he leaves it and prays 'Asr first, then enters into 'Asr for the sake of the order. Yes.
May Allah reward you, Your Eminence, father. The questioner says: A man forgot the 'Asr prayer and did not remember it until he was praying Maghrib in congregation behind the imam. What is required of him?
Answer:
He is required to leave the Maghrib prayer and pray 'Asr first, then pray Maghrib afterwards, because the order is obligatory, and he remembered it before he had finished the Maghrib prayer. However, if he had finished the Maghrib prayer and did not remember it until after he had said the taslim of Maghrib, he would pray 'Asr, and the order would be dropped due to his forgetfulness. But here, he remembered it while he was praying. So he leaves it and prays 'Asr first, then enters into 'Asr for the sake of the order. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [224- 4717] من نسي صلاة العصر ولم يذكر إلا وهو في صلاة المغرب فماذا يفعل؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.