Sahih Muslim 325
Sahih Muslim · Book 3: 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
Anas said:
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا وَكِيعٌ ، عَنْ مِسْعَرٍ ، عَنِ ابْنِ جَبْرٍ ، عَنْ أَنَسِ ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يَتَوَضَّأُ بِالْمُدِّ وَيَغْتَسِلُ بِالصَّاعِ إِلَى خَمْسَةِ أَمْدَادٍ .
The Apostle of Allah (ﷺ) performed ablution with one Mudd and took bath with a Sa' up to five Mudds.