Is it permissible to pray the 'Isha' prayer shortened behind someone who is praying the Maghrib prayer?
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Question:
He says: Honorable Shaykh, may Allah grant you success. If I join behind someone who is praying the Maghrib prayer in the second rak'ah, and I want to pray the 'Isha' prayer shortened, is that permissible for me?
Answer:
No, it is not permissible to shorten the 'Isha' prayer behind the Maghrib prayer, because the Maghrib prayer is not shortened. One prays behind a prayer that is not shortened, so he does not shorten it. Yes. The one who prays 'Isha' behind Maghrib does not shorten it, first because the Maghrib prayer is not shortened, neither for a resident nor for a traveler, and second because if the imam is a resident, it is not permissible to shorten behind him. Whoever prays behind a resident must complete the prayer. Yes.
He says: Honorable Shaykh, may Allah grant you success. If I join behind someone who is praying the Maghrib prayer in the second rak'ah, and I want to pray the 'Isha' prayer shortened, is that permissible for me?
Answer:
No, it is not permissible to shorten the 'Isha' prayer behind the Maghrib prayer, because the Maghrib prayer is not shortened. One prays behind a prayer that is not shortened, so he does not shorten it. Yes. The one who prays 'Isha' behind Maghrib does not shorten it, first because the Maghrib prayer is not shortened, neither for a resident nor for a traveler, and second because if the imam is a resident, it is not permissible to shorten behind him. Whoever prays behind a resident must complete the prayer. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3171- 4717] هل يجوز صلاة العشاء مقصورة خلف من يصلي المغرب؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.