Abd Khayr reported,

Ali came to us after he had already prayed and asked for water for purification. We said to ourselves, "What does he want with water for purification when he has already prayed? He only wants to teach us."A vessel containing water was brought, along with a basin. He poured water from the vessel onto his right hand and washed his hands three times. Then he rinsed his mouth and blew water from his nose three times, rinsing and blowing from the same handful with which he scooped the water. Then he washed his face three times, then washed his right arm three times, then his left arm three times. Then he placed his hand in the vessel and wiped his head once. Then he washed his right foot three times and his left foot three times.Then he said, "Whoever is pleased to know how the Messenger of Allah ﷺ performed his ablution, this is it."

حدثنا مسدد حدثنا أبو عوانة عن خالد بن علقمة

عن عبد خير قال

أتانا علي رضي الله عنه وقد صلى فدعا بطهور فقلنا ما يصنع بالطهور وقد صلى ما يريد إلا ليعلمنا فأتي بإناء فيه ماء وطست فأفرغ من الإناء على يمينه فغسل يديه ثلاثا ثم تمضمض واستنثر ثلاثا فمضمض ونثر من الكف الذي يأخذ فيه ثم غسل وجهه ثلاثا ثم غسل يده اليمنى ثلاثا وغسل يده الشمال ثلاثا ثم جعل يده في الإناء فمسح برأسه مرة واحدة ثم غسل رجله اليمنى ثلاثا ورجله الشمال ثلاثا ثم قال من سره أن يعلم وضوء رسول الله ﷺ فهو هذا