(12) باب تَرْكِ الْمَرْأَةِ نَقْضَ رَأْسِهَا عِنْدَ الاِغْتِسَالِ
'Aishah said:
"I remember performing Ghusl - myself and the Messenger of Allah (ﷺ), from this" - a vessel like a Sa' or smaller. "We both started taking water from it and I poured water over my head with my hand, three times, without undoing any of my hair."
Reference: Sunan an-Nasa'i 416
In-book reference: Book 4, Hadith 21
English translation: Vol. 1, Book 4, Hadith 416