Uthman bin Abd al-Rahman al-Taymi says that Ibn Abi Mulaykah was asked about ablution, and he said: I saw Sayyiduna Uthman bin Affan (may Allah be pleased with him); he too was asked about ablution, and he called for water. Then he narrated the long hadith, saying: He took water and wiped his head and ears, washing the outer and inner parts of the ears once only, then he washed his feet. Then he asked: Where are those who were asking about ablution? "The Messenger of Allah (peace and blessings be upon him) used to perform ablution in this way (just as I have done)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 301
It is narrated from Rubayyi' bint Mu'awwidh (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) wiped the outer and inner parts of his ears.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 302
Humayd says: Sayyiduna Anas (may Allah be pleased with him) performed ablution while we were with him. He wiped the outer and inner parts of his ears, and he saw us looking at him intently, so he said: Sayyiduna Ibn Mas'ud (may Allah be pleased with him) used to command us to do this.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 303
Humayd says: I saw Sayyiduna Anas bin Malik (may Allah be pleased with him) performing ablution. He wiped the outer and inner parts of his ears, and we looked at him, so he said: Ibn Umm Abd (Abdullah bin Mas'ud, may Allah be pleased with him) used to command us to do exactly this.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 304