Sunan Ibn Majah Book 1, Hadith 172

"The Messenger of Allah performed ablution and wiped his head twice."

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"I saw the Messenger of Allah performing ablution, and he wiped his head once."

Sunan Ibn Majah Book 1, Hadith 171
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The Messenger of Allah wiped his ears, putting his forefingers in his ears and wiping the back of them with his thumbs, so he wiped them inside and out.

Sunan Ibn Majah Book 1, Hadith 173