The Book of Menstruation and Istihadah
3/21. Chapter:
A Menstruating Woman Washing Her Husband's Head
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ كُنْتُ أُرَجِّلُ رَأْسَ رَسُولِ اللَّهِ صلى الله عليه وسلم وَأَنَا حَائِضٌ .
It was narrated that 'Aishah said: "I used to comb the hair of the Messenger of Allah (ﷺ) while I was menstruating."
Reference : Sunan an-Nasa'i 389In-book reference : Book 3, Hadith 42English translation : Vol. 1, Book 3, Hadith 389