Sunan an-Nasai Book 1, Hadith 115

أَخْبَرَنَا مُحَمَّدُ بْنُ آدَمَ، عَنِ ابْنِ أَبِي زَائِدَةَ، قَالَ حَدَّثَنِي أَبِي وَغَيْرُهُ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي حَيَّةَ الْوَادِعِيِّ، قَالَ رَأَيْتُ عَلِيًّا تَوَضَّأَ فَغَسَلَ كَفَّيْهِ ثَلاَثًا وَتَمَضْمَضَ وَاسْتَنْشَقَ ثَلاَثًا وَغَسَلَ وَجْهَهُ ثَلاَثًا وَذِرَاعَيْهِ ثَلاَثًا ثَلاَثًا وَمَسَحَ بِرَأْسِهِ وَغَسَلَ رِجْلَيْهِ ثَلاَثًا ثَلاَثًا قَالَ هَذَا وُضُوءُ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏

It was narrated that Abu Hayyah Al-Wadi'i said:I saw 'Ali performing Wudu'. He washed his hands three times, and rinsed his mouth three times and his nose three times, and he washed his face three times and each forearm three times. Then he wiped his head and washed each foot three times. Then he said: 'This is the Wudu' of the Prophet (ﷺ)