Sahih Muslim 297 b
The Book of Menstruation
It is permissible for a menstruating woman to wash her husband’s head, and comb his hair; her leftovers are pure (tahir); and regarding reclining in her lap and reciting Qur’an
'Amra daughter of 'Abd al-Rahman reported: 'A'isha, wife of the Messenger of Allah (ﷺ) observed: When I was (in I'tikaf), I entered the house for the call of nature, and while passing I inquired after the health of the sick (in the. family), and when the Messenger of Allah (ﷺ) was (in I'tikaf), he put out his head towards me, while he himself was in the mosque, and I combed his hair; and he did not enter the house except for the call of nature so long as he was In I'tikaf; and Ibn Rumh stated: As long as they (the Prophet (ﷺ) and his wives) were among the observers of I'tikaf.