Muwatta Malik #133
Purity
Yahya related to me from Malik from Hisham ibn Urwa from his
father that A'isha, the wife of the Prophet, may Allah bless him and
grant him peace, said, "I used to comb the head of the Messenger of
Allah, may Allah bless him and grant him peace, while I was
menstruating."
About Muwatta Malik
This hadith is #133 from Muwatta Malik, in the Book of Purity. Muwatta Malik contains 1,985 hadiths across 61 books.