What is obligatory for a traveler if he prays behind a resident imam?
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Question:
A traveler prayed with a resident, and he did not know that completing the prayer was not obligatory for him. What is obligatory for him? Is he required to repeat the prayer or not?
Answer:
If he shortened the prayer behind the resident, he must repeat the prayer, because the one who prays behind the resident takes on his ruling; he follows him and completes the prayer with him. The Messenger of Allah (peace and blessings be upon him) said: "The imam is appointed to be followed." When Ibn 'Abbas (may Allah be pleased with him and his father) was asked, "Why does the traveler complete the prayer behind the resident?" he said, "That is the Sunnah," meaning the Sunnah of the Messenger of Allah (peace and blessings be upon him). Allah knows best, and may Allah send prayers and peace upon our Prophet Muhammad, and upon his family and all his Companions.
A traveler prayed with a resident, and he did not know that completing the prayer was not obligatory for him. What is obligatory for him? Is he required to repeat the prayer or not?
Answer:
If he shortened the prayer behind the resident, he must repeat the prayer, because the one who prays behind the resident takes on his ruling; he follows him and completes the prayer with him. The Messenger of Allah (peace and blessings be upon him) said: "The imam is appointed to be followed." When Ibn 'Abbas (may Allah be pleased with him and his father) was asked, "Why does the traveler complete the prayer behind the resident?" he said, "That is the Sunnah," meaning the Sunnah of the Messenger of Allah (peace and blessings be upon him). Allah knows best, and may Allah send prayers and peace upon our Prophet Muhammad, and upon his family and all his Companions.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما الواجب على المسافر إذا صلى خلف إمام مقيم؟ للشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.