حَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، حَدَّثَنَا مَعْمَرٌ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم بِمِثْلِهِ غَيْرَ أَنَّهُ قَالَ ‏"‏ حَتَّى يَظَلَّ الرَّجُلُ إِنْ يَدْرِي كَيْفَ صَلَّى ‏"‏ ‏.‏

A hadith like it has been narrated by Abu Huraira but for these words: " He (the man saying the prayer) does not know how much he has prayed. Translation Not Available

Book Ref: Sahih Muslim Book 4 Hadith 757
Web Ref:  Sahih Muslim Book 4 Hadith 389 e