(10) باب الْقَدْرِ الْمُسْتَحَبِّ مِنَ الْمَاءِ فِي غُسْلِ الْجَنَابَةِ وَغُسْلِ الرَّجُلِ وَالْمَرْأَةِ فِي إِنَاءٍ وَاحِدٍ فِي حَالَةٍ وَاحِدَةٍ وَغُسْلِ أَحَدِهِمَا بِفَضْلِ الآخَرِ
Hafsa, daughter of 'Abd al-Rahman b. Abu Bakr, reported that 'A'isha narrated to her that she and the Messenger of Allah (ﷺ) took a bath from the same vessel which contained water equal to three Mudds or thereabout.
Reference: Sahih Muslim 321 b
In-book reference: Book 3, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Book 3, Hadith 628