Sayyiduna Uthman (may Allah be pleased with him) said: Shall I not show you what the ablution of the Prophet (peace and blessings be upon him) was like? The people replied: Yes! So he called for water and rinsed his mouth three times, put water into his nose three times, washed his face three times, washed both his arms three times, wiped his head, and washed both his feet three times. Then he said: Know that the two ears are part of the head. Then Sayyiduna Uthman (may Allah be pleased with him) said: I have carefully shown you the way of ablution of the Prophet (peace and blessings be upon him).
Ahmad recorded it, and it contains two unknown (majhul) men.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1195