Sahih al-Bukhari Book 33, Hadith 5
(the wife of the Prophet) Allah's Messenger (ﷺ) used to let his head in (the house) while he was in the
mosque and I would comb and oil his hair. When in I`tikaf he used not to enter the house except for a
need.
The Prophet (ﷺ) used to (put) bend his head (out) to me while he was in I`tikaf in the mosque during my monthly periods and I would comb and oil his hair.
The Prophet (ﷺ) used to embrace me during my menses. He also used to put his head out of the mosque while he was in I`tikaf, and I would wash it during my menses.