The Book of Prayers
4/8. Chapter:
The Virtue Of the Adhan, And The Shaitan Flees When He Hears It
Sahih Muslim
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.
Reference : Sahih Muslim 389eIn-book reference : Book 4, Hadith 23USC-MSA web (English) reference : Book 4, Hadith 757