From Sahih Muslim (Hadith 747):
Ubaid b. Umair reported:It was conveyed to 'A'isha that 'Abdullah b. 'Amr ordered the women to undo the (plaits) of hair on their heads. She said: How strange it is for Ibn 'Amr that he orders the women to undo the plaits of their head while taking a bath; why does he not order them to shave their beads? I and the Messenger of Allah (ﷺ) took bath from one vessel. I did no more than this that I poured three handfuls of water over my head
Reference: Muslim 747