Sahih al-Bukhari 191
صحيح البخاري#191Sahihحَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا خَالِدُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا عَمْرُو بْنُ يَحْيَى، عَنْ أَبِيهِ، عَنْ عَبْدِ اللَّهِ بْنِ زَيْدٍ، أَنَّهُ أَفْرَغَ مِنَ الإِنَاءِ عَلَى يَدَيْهِ فَغَسَلَهُمَا، ثُمَّ غَسَلَ أَوْ مَضْمَضَ، وَاسْتَنْشَقَ مِنْ كَفَّةٍ وَاحِدَةٍ، فَفَعَلَ ذَلِكَ ثَلاَثًا، فَغَسَلَ يَدَيْهِ إِلَى الْمِرْفَقَيْنِ مَرَّتَيْنِ مَرَّتَيْنِ، وَمَسَحَ بِرَأْسِهِ مَا أَقْبَلَ وَمَا أَدْبَرَ، وَغَسَلَ رِجْلَيْهِ إِلَى الْكَعْبَيْنِ، ثُمَّ قَالَ هَكَذَا وُضُوءُ رَسُولِ اللَّهِ صلى الله عليه وسلم.
Narrated `Amr bin Yahya:(on the authority of his father) `Abdullah bin Zaid poured water on his hands from a utensil containing water and washed them and then with one handful of water he rinsed his mouth and cleaned his nose by putting water in it and then blowing it out. He repeated it thrice. He, then, washed his hands and forearms up to the elbows twice and passed wet hands over his head, both forwards and backwards, and washed his feet up to the ankles and said, "This is the ablution of Allah's Messenger (ﷺ)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 4:57