Narrated Anas (rad):

Allah’s Messenger (ﷺ) used only one Mudd of water for ablution and one Sa’ to five Mudd of water for his bath [ Agreed upon].

وَعَنْهُ قَالَ: { كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-يَتَوَضَّأُ بِالْمُدِّ, وَيَغْتَسِلُ بِالصَّاعِ إِلَى خَمْسَةِ أَمْدَادٍ } مُتَّفَقٌ عَلَيْه ِ [1]‏ .‏