Sahih Muslim Book 003, Hadith Number 0585.

Chapter : The menstruating woman is permitted to wash the head of her husband, comb his hair, and her left-over is clean, and one is permitted to recline in her lap and recite the Qur'an.

'Urwa reported it from 'Aisha that she observed: The Messenger of Allah (may peace be upon him) inclined his head towards me (from the mosque) while I was in my apartment and I combed it in a state of menstruation.