Sahih al-Bukhari
Sahih al-Bukhari 157
The washing of the body parts (i.e., the parts which are washed in ablution) once only while performing ablution
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَتَوَضَّأَ النَّبِيُّ صلى الله عليه وسلم مَرَّةً مَرَّةً.
Translation
Narrated Ibn `Abbas
The Prophet (ﷺ) performed ablution by washing the body parts only once.