Bulugh al-Maram, Book 1, Hadith 65 (In-Book)

Narrated Anas (rad): Allah’s Messenger 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 ِ (71)‏.‏ ‏5 ‏- صحيح.‏ رواه البخاري (201)‏، ومسلم (325)‏ (51)‏.‏

sunnah.com

also referenced under: Book 1, Hadith 61 (English)