What does the ma'mum do if he does not shorten the prayer behind an imam who shortens it?
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Question:
May Allah reward you, Honorable Shaykh. This questioner says: If a praying ma'mum joins an imam with the intention of not shortening the four-rak'ah prayer, while the ma'mum considers himself to be traveling, and then he says the taslim with the imam who shortens, and they are both travelers.
Answer:
If he does not consider shortening the prayer permissible, but the imam does, then when the imam says the taslim, he stands up and completes the prayer after the imam. He completes it.
May Allah reward you, Honorable Shaykh. This questioner says: If a praying ma'mum joins an imam with the intention of not shortening the four-rak'ah prayer, while the ma'mum considers himself to be traveling, and then he says the taslim with the imam who shortens, and they are both travelers.
Answer:
If he does not consider shortening the prayer permissible, but the imam does, then when the imam says the taslim, he stands up and completes the prayer after the imam. He completes it.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/1802] ماذا يفعل المأموم إذا لم يقصر خلف إمام يقصر؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.