"Allah's Messenger prayed the Subh prayer, and he had difficulty with the recitation. When turned (after finishing) he said: 'I think that you are reciting behind your Imam?'" He said: "We said: 'Yes, Messenger of Allah, by Allah!' He said: 'Do not do that, except for Umm Al-Kitab, for there is no Salat for one who does not recite it.'"
Reference: Jami` at-Tirmidhi 311 In-book : Book 2, Hadith 163 English translation : Vol. 1, Book 2, Hadith 311
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