Sayyiduna Safinah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) used to bathe with one sa' and perform ablution with one mudd.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 932
It is narrated from Sayyiduna Safinah (may Allah be pleased with him) that one mudd was sufficient for the ablution of the Messenger of Allah (peace and blessings be upon him), and one sa' was sufficient for his bath.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 933
Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) used to perform ablution with one mudd and bathe with one sa'.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 934
Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "One mudd (of water) suffices for ablution, and one sa' (of water) for the ritual bath of major ritual impurity."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 935
Yazid alone narrates with the same chain that the Messenger of Allah (peace and blessings be upon him) used to perform ablution with one mudd (of water) and bathe with one sa' (of water).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 936
Abu Ja'far (may Allah have mercy on him) was with Sayyiduna Jabir (may Allah be pleased with him) when some people asked him about the ritual bath for major ritual impurity. He said: A sa' (of water) is sufficient. A man said: By Allah! This water will not be enough for me, nor for so-and-so. Sayyiduna Jabir (may Allah be pleased with him) said: It was sufficient for one who had more hair than you and who was better than you.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 937
(a) It is narrated from Sayyidah Aishah (may Allah be pleased with her) that her foster brother asked about the ritual bath of the Prophet (peace and blessings be upon him) for major ritual impurity, so she called for water of about the measure of a sa', bathed, and poured water over her head three times. (b) Shu'bah (may Allah have mercy on him) said: "About the measure of a sa'." (c) In Sahih Muslim this narration is reported from Shu'bah (may Allah have mercy on him), and it has the additional words: "There was a screen between us and her (Sayyidah Aishah, may Allah be pleased with her)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 938