(2) باب غَسْلِ الْحَائِضِ رَأْسَ زَوْجِهَا وَتَرْجِيلِهِ
Narrated `Urwa:
A person asked me, "Can a woman in menses serve me? And can a Junub woman come close to me?" I replied, "All this is easy for me. All of them can serve me, and there is no harm for any other person to do the same. `Aisha told me that she used to comb the hair of Allah's Messenger (ﷺ) while she was in her menses, and he was in I`tikaf (in the mosque). He would bring his head near her in her room and she would comb his hair, while she used to be in her menses."
Reference: Sahih al-Bukhari 296
In-book reference: Book 6, Hadith 3
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 6, Hadith 295