I was traveling, so I prayed the 'Isha' prayer as two rak'ahs behind a resident imam who was praying the Maghrib prayer. Is my action valid?
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Question:
He says: Honorable Shaykh, may Allah grant you success. I was traveling and entered the mosque to pray the Maghrib and 'Isha' prayers. I prayed the Maghrib prayer alone, then the imam stood up to perform the Maghrib prayer, so I joined him to pray with him with the intention of 'Isha'. Then I said the taslim after the second rak'ah. Is this action of mine valid? No, it is not valid.
Answer:
Because you shortened the prayer behind a prayer that is not shortened, which is the Maghrib. So your action is not valid. You were in a hurry. Why did you not wait until he stood up for the Maghrib and you prayed it, then you prayed the 'Isha' prayer shortened after the imam said the taslim from the Maghrib? This is the correct way. Yes.
He says: Honorable Shaykh, may Allah grant you success. I was traveling and entered the mosque to pray the Maghrib and 'Isha' prayers. I prayed the Maghrib prayer alone, then the imam stood up to perform the Maghrib prayer, so I joined him to pray with him with the intention of 'Isha'. Then I said the taslim after the second rak'ah. Is this action of mine valid? No, it is not valid.
Answer:
Because you shortened the prayer behind a prayer that is not shortened, which is the Maghrib. So your action is not valid. You were in a hurry. Why did you not wait until he stood up for the Maghrib and you prayed it, then you prayed the 'Isha' prayer shortened after the imam said the taslim from the Maghrib? This is the correct way. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [440 -521] كنت مسافرا فصليت العشاء ركعتين وراء إمام مقيم يصلي المغرب، فهل فعلي صحيح؟ - صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.