مُوَطَّأُ مَالِكٍ
Muwatta Malik 133
Purity
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَنَّهَا قَالَتْ كُنْتُ أُرَجِّلُ رَأْسَ رَسُولِ اللَّهِ صلى الله عليه وسلم وَأَنَا حَائِضٌ .
Yahya related to me from Malik from Hisham ibn Urwa from his father that A'isha, the wife of the Prophet, (ﷺ), said, "I used to comb the head of the Messenger of Allah, (ﷺ), while I was menstruating."
Arabic/English book reference: Book 2, Hadith 104