The Messenger of Allah ﷺ took a bath with one Saʿ of water because of sexual intercourse and performed ablution with one Mudd.
كَانَ رَسُولُ اللَّهِ ﷺ يُغَسِّلُهُ الصَّاعُ مِنَ الْمَاءِ مِنَ الْجَنَابَةِ وَيُوَضِّؤُهُ الْمُدُّ
[Machine] The ship of the servant of the messenger of Allah ﷺ informed me that the messenger of Allah ﷺ used to perform ablution with a mudd (a measurement unit) and wash his body with one sa' (another measurement unit) of water from ritual impurity.
أَخْبَرَنِي سَفِينَةُ مَوْلَى رَسُولِ اللهِ ﷺ أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُوَضِّئُهُ الْمُدُّ وَيَغْسِلُهُ الصَّاعُ مِنَ الْجَنَابَةِ