It is narrated from Sayyidah Aishah (may Allah be pleased with her): The Messenger of Allah (peace and blessings be upon him) and I used to take the ritual bath for janabah from a single vessel, our hands alternating (in taking water). (b) Imam al-Bukhari and Muslim narrated it from al-Qa'nabi. (c) In the narration of Aflah there is the addition: our hands would meet. In our view, the meaning of the words 'takhtalifu aydina fihi' (our hands alternated in it) is that both of them would put their hands into the vessel to take water.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 885