Sayyidah Umm Salamah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) would perform ablution with one mudd (of water) and take the ritual bath with one sa'.
Imam al-Tabarani recorded this report in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat. The chain of al-Mu'jam al-Awsat contains a narrator, Sayf bin Muhammad, and he is kadhdhab (a liar); the chain of al-Mu'jam al-Kabir contains a narrator, Sinan bin Harun. Yahya bin Ma'in says: Sinan bin Harun is the brother of Sayf bin Harun, and he is in a better condition than his brother. Imam al-Nasa'i (may Allah have mercy on him) declared him "da'if" (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1105