The 'Isha' prayer behind an imam who is praying Maghrib
Machine translationRead the Arabic original
The questioner:
Honorable Shaykh Salih, one of the brothers says: I entered the mosque congregation intending to pray the 'Isha' prayer, but the imam was praying the Maghrib prayer. What should this congregation do so that their prayer is valid?
The Shaykh:
The best for them is to pray on their own. When the imam concludes the prayer, they pray the 'Isha' on their own. They do not pray in congregation at the same time as two congregations at once. But when the imam concludes the prayer, they pray the 'Isha'. Yes.
The questioner:
Does it harm them that their intention differs from the imam's?
The Shaykh:
It does not cause harm if they join the imam with the intention of 'Isha. When he says the salam, they stand up and perform the fourth rak'ah, then say the salam for themselves. There is no harm in that. Yes.
Honorable Shaykh Salih, one of the brothers says: I entered the mosque congregation intending to pray the 'Isha' prayer, but the imam was praying the Maghrib prayer. What should this congregation do so that their prayer is valid?
The Shaykh:
The best for them is to pray on their own. When the imam concludes the prayer, they pray the 'Isha' on their own. They do not pray in congregation at the same time as two congregations at once. But when the imam concludes the prayer, they pray the 'Isha'. Yes.
The questioner:
Does it harm them that their intention differs from the imam's?
The Shaykh:
It does not cause harm if they join the imam with the intention of 'Isha. When he says the salam, they stand up and perform the fourth rak'ah, then say the salam for themselves. There is no harm in that. Yes.
Source
نور على الدرب - الفوزان - 03/196 — archive.org (15:57)
The Arabic text is a machine transcription of the audio recording.