The Messenger of Allah (ﷺ) used to observe I'tikaf in the mosque and put his head near me through the opening of the apartment, and I would wash his head. Musaddad said: "And I would comb it while I was menstruating."
Reference: Sunan Abi Dawud 2469 In-book : Book 14, Hadith 157 English translation : Book 13, Hadith 2463
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