Sahih al-Bukhari 157
Book 4: Ablutions (Wudu') · Narrated by Ibn `Abbas
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ تَوَضَّأَ النَّبِيُّ صلى الله عليه وسلم مَرَّةً مَرَّةً.
English translation
Narrated Ibn `Abbas:The Prophet (ﷺ) performed ablution by washing the body parts only once
Reference: Sahih al-Bukhari 157, Book of Ablutions (Wudu'). English translation by Dr. Muhammad Muhsin Khan.