Sunan an Nasai
The Book of Water
Hadith #20
2.20
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 .
It was narrated from 'Aishah that she used to perform Ghusl with the Messenger of Allah (ﷺ) from a single vessel