أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ أَنْبَأَنَا خَالِدٌ، قَالَ حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَطَاءٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ فِي كُلِّ صَلاَةٍ قِرَاءَةٌ فَمَا أَسْمَعَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم أَسْمَعْنَاكُمْ وَمَا أَخْفَاهَا أَخْفَيْنَا مِنْكُمْ ‏.‏

It was narrated that Abu Hurairah said: "In every prayer there is recitation. What the Messenger of Allah (PBUH) made us hear (by reciting out loud) we make you hear, and what he hid from us (by reciting silently) we hide from you." Translation Not Available

Book Ref: Sunan An Nisai Book 11 Hadith 970
Web Ref:  Sunan An Nisai Vol 2 Book 11 Hadith 971