Abu Anas says: Hadrat Uthman bin Affan (may Allah be pleased with him) performed ablution at al-Maqa'id and said: Shall I not show you the ablution of the Messenger of Allah (peace and blessings be upon him)? Then he performed ablution, washing each part three times. Sufyan says: Abu al-Nadr narrates from Abu Anas: Some Companions (may Allah be pleased with them) were with him, and he said: Did you not see the Messenger of Allah (peace and blessings be upon him) performing ablution like this? They said: Of course, we saw it just like this.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 371