Sunan an-Nasa'i, Book 2, Hadith 20 (In-Book) ⓘ
It was narrated from 'Aishah that she used to perform Ghusl with the Messenger of Allah from a single vessel.
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، أَنَّهَا كَانَتْ تَغْتَسِلُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي الإِنَاءِ الْوَاحِدِ .
also referenced under: Hadith 344 (Reference) & Volume 1, Book 2, Hadith 345 (DarusSalam)