"We came to 'Ali bin Abi Talib, may Allah be pleased with him, and he had prayed. He called for water and we said: 'What is he going to do with it when he has (already) prayed? He only wants to teach us.' A vessel of water and a basin were brought to him. He poured some water onto his hand and washed it three times, then he rinsed his mouth and nose three times from the hand with which he took the water. Then he washed his face three times, and he washed his right hand three times, and his left hand three times, and wiped his head once, then he washed his right foot three times and his left foot three times. Then he said: 'Whoever would like to learn how the Messenger of Allah ﷺ did Wudu', this is it.'" (Using translation from Nasāʾī 92)  

أَنْ يَعْلَمَ وَضُوءَ رَسُولِ اللهِ ﷺ فَهُوَ هَذَا  

"I saw the Messenger of Allah performing ablution and he wiped his head once." (Using translation from Ibn Mājah 435)   

رَأَيْتُ رَسُولَ اللهِ ﷺ «تَوَضَّأَ وَمَسَحَ بِرَأْسِهِ وَأُذُنَيْهِ مُرَّةً»  

"I saw the Messenger of Allah ﷺ perform Wudu'; he washed his face three times and his hands twice, he washed his feet twice and wiped his head twice." (Using translation from Nasāʾī 99)  

رَأَيْتُ رَسُولَ اللهِ ﷺ «تَوَضَّأَ فَغَسَلَ وَجْهَهُ ثَلَاثًا وَيَدَيْهِ مَرَّتَيْنِ وَغَسَلَ رِجْلَيْهِ مَرَّتَيْنِ وَمَسَحَ بِرَأْسِهِ مَرَّتَيْنِ»