Mishkat al-Masabih #2571
The Rites of Pilgrimage
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن أَبِي أَيُّوبَ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَغْسِلُ رَأْسَهُ وَهُوَ مُحْرِمٌ
Abu Ayyub said that the Prophet used to wash his head when he was in the sacred state.
Bukhari and Muslim.
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About Mishkat al-Masabih
This hadith is #2571 from Mishkat al-Masabih, in the Book of The Rites of Pilgrimage.