Musnad Ahmad 30:578

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, 'Ata' informed me that he heard Abu Hurayrah informing them: "In every prayer there is recitation. So, what the Messenger of Allah (peace and blessings of Allah be upon him) made us hear, we have made you hear, and what he kept hidden from us, we have kept hidden from you." Ibn Bakr said: In every prayer there is Quran.