(20) باب تَرْجِيلِ الْحَائِضِ رَأْسَ زَوْجِهَا وَهُوَ مُعْتَكِفٌ فِي الْمَسْجِدِ
It was narrated from 'Aishah that she used to comb the hair of the Messenger of Allah (ﷺ) when she was menstruating and he was performing I'tikaf. He would put his head out to her while she was in her room.
Reference: Sunan an-Nasa'i 386
In-book reference: Book 3, Hadith 39
English translation: Vol. 1, Book 3, Hadith 386