'Abbad bin Tamim narrated that his paternal uncle said:"A complaint was made to the Prophet about a man who sensed something (some doubt about his ablution) during prayer. He said: 'No (he does not have to perform ablution) unless he notices a smell or hears a sound.'"
حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، قَالَ أَنْبَأَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدٍ، وَعَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، قَالَ شُكِيَ إِلَى النَّبِيِّ ـ صلى الله عليه وسلم ـ الرَّجُلُ يَجِدُ الشَّىْءَ فِي الصَّلاَةِ فَقَالَ " لاَ حَتَّى يَجِدَ رِيحًا أَوْ يَسْمَعَ صَوْتًا " .
IbnMaja
The Book of Purification and its Sunnah • Hadith 513