(3) باب جَوَازِ غَسلِ الْحَائِضِ رَأْسَ زَوْجِهَا وَتَرْجِيلِهِ وَطَهَارَةِ سُؤْرِهَا وَالاِتِّكَاءِ فِي حِجْرِهَا وَقِرَاءَةِ الْقُرْآنِ فِيهِ
Al-Aswad narrated it from 'A'isha that she observed:
I used to wash the head of the Messenger of Allah (ﷺ), while I was in a state of menstruation.
Reference: Sahih Muslim 297 e
In-book reference: Book 3, Hadith 10
USC-MSA web (English) reference(deprecated numbering scheme): Book 3, Hadith 586