Ubayd bin Umayr said: It reached Sayyidah Aishah (may Allah be pleased with her) that Sayyiduna Abdullah bin Amr (may Allah be pleased with him) was ordering women to undo (the braids of) their heads when they took the ritual bath. Sayyidah Aishah (may Allah be pleased with her) said: How strange of Ibn Amr (may Allah be pleased with him)! Why does he not order them to shave their heads? The Messenger of Allah (peace and blessings be upon him) and I used to bathe from a single vessel, and I did no more than pour three handfuls over my head.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 859