Sayyidah Aishah (may Allah be pleased with her) narrates that when he (peace and blessings be upon him) was in i'tikaf, he would bring his blessed head close to me and I would comb it, but he (peace and blessings be upon him) would not enter the house except for a human need. Sayyidah Aishah (may Allah be pleased with her) also narrates that he (peace and blessings be upon him) would put his head towards me while he (peace and blessings be upon him) remained in the mosque, and I would comb it.
(In the narration of Ibn Wahb: The Prophet (peace and blessings be upon him) would not enter the house except for a human need. Sayyidah Aishah (may Allah be pleased with her) narrates that he (peace and blessings be upon him) would put his head in towards me while he (peace and blessings be upon him) remained in the mosque, and I would comb his hair.)
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8570