We prayed behind an imam who recited {al-dallin} with a zay and {al-sirat} with a sin in al-Fatihah; is our prayer valid?
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The questioner:
Honorable Shaykh, may Allah grant you success, he says: One day our mosque’s imam was absent, so one of the attendees led us in prayer and neglected the recitation of al-Fatihah. He asks: Is our prayer valid, or must we repeat it?
The Shaykh:
How did he neglect it? We do not know what kind of error it was.
The questioner:
For example, may Allah preserve you, he says: He recited "al-dallin" as "al-zallin" with a zay, and "al-sirat" with a sin.
The Shaykh:
Is it due to his dialect? Is he Egyptian or what? No, it is not acceptable if the letter is changed; it is not acceptable.
Honorable Shaykh, may Allah grant you success, he says: One day our mosque’s imam was absent, so one of the attendees led us in prayer and neglected the recitation of al-Fatihah. He asks: Is our prayer valid, or must we repeat it?
The Shaykh:
How did he neglect it? We do not know what kind of error it was.
The questioner:
For example, may Allah preserve you, he says: He recited "al-dallin" as "al-zallin" with a zay, and "al-sirat" with a sin.
The Shaykh:
Is it due to his dialect? Is he Egyptian or what? No, it is not acceptable if the letter is changed; it is not acceptable.
Source
قناة «العلامة الدكتور صالح الفوزان»، [724 -3022] صلينا خلف إمام قرأ في الفاتحة {الضالين} بالزاي و{الصراط} بالسين، فهل صلاتنا صحيحة؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.