Sunan Ibn Majah Book 1, Hadith 170

The Messenger of Allah wiped his head once.

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

Sunan Ibn Majah Book 1, Hadith 169
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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