صَحِيحُ مُسْلِمٍ
Sahih Muslim 326 a
The Book of Menstruation
The amount of water with which it is recommended to perform ghusl in the case of janabah; a man and woman washing from a single vessel; one of them washing with the left-over water of the other
وَحَدَّثَنَا أَبُو كَامِلٍ الْجَحْدَرِيُّ، وَعَمْرُو بْنُ عَلِيٍّ، كِلاَهُمَا عَنْ بِشْرِ بْنِ الْمُفَضَّلِ، - قَالَ أَبُو كَامِلٍ حَدَّثَنَا بِشْرٌ، - حَدَّثَنَا أَبُو رَيْحَانَةَ، عَنْ سَفِينَةَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُغَسِّلُهُ الصَّاعُ مِنَ الْمَاءِ مِنَ الْجَنَابَةِ وَيُوَضِّؤُهُ الْمُدُّ .
Safina reported: The Messenger of Allah (ﷺ) took a bath with one Sa` of water because of sexual intercourse and performed ablution with one Mudd.
Sahih Muslim, 326 aSahihصحيح