Musnad Ahmad 30:1405

'Affan narrated to us, Hammad narrated to us, from Qays and Habib, from 'Ata' ibn Abi Rabah, from Abu Hurayrah, that he said: "In every prayer, there is recitation. So, whatever the Messenger of Allah (peace and blessings of Allah be upon him) made us hear, we have made you hear; and whatever he kept hidden from us, we have kept hidden from you."