Sunan an-Nasa'i, Book 1, Hadith 277 (In-Book) ⓘ
It was narrated that 'Aishah said: "The Prophet would put his head out while he was in I'tikaf and I would wash it, while I was menstruating."
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنِي مَنْصُورٌ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ كَانَ النَّبِيُّ صلى الله عليه وسلم يُومِئُ إِلَىَّ رَأْسَهُ وَهُوَ مُعْتَكِفٌ فَأَغْسِلُهُ وَأَنَا حَائِضٌ .
also referenced under: Volume 1, Book 1, Hadith 276 (DarusSalam)