وَعَنْهُ قَالَ: «كَانَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَتَوَضَّأُ بِالْمُدِّ، وَيَغْتَسِلُ بِالصَّاعِ إِلَى خَمْسَةِ أَمْدَادٍ»
The Messenger of Allah (sallallahu alayhi wa sallam) used only one Mudd of water for ablution and one Sa to five Mudd of water for his bath.
Bulugh al-Maram 65, Book 1, The Book of Purification, Hadith 65. 1 min read