347 - Abu Bakr ibn Ishaq informed us, saying: Al-Hasan ibn Musa narrated to us, Shayban narrated to us, from Qatadah, from Al-Hasan, from his mother, from 'A'ishah, who said: "The Messenger of Allah (peace and blessings be upon him) used to perform ablution with a mudd (of water), and he used to perform the major ritual bath with a sa' (of water)."

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Her hadith has already been cited under number (227) — and it is in the Sahih — that her foster brother asked her about the Prophet's (peace and blessings be upon him) major ritual bath, so she called for a vessel containing water measuring about a sa' ... and the rest of the hadith. See also the hadith that follows.

(1) A sound hadith, and this chain is good on account of Umm Al-Hasan — who is Al-Basri — and her name is Khayrah. A group narrated from her, and Ibn Hibban mentioned her in "Al-Thiqat" 4/216. All the compilers of the hadith collections narrated from her except Al-Bukhari. The rest of its narrators are trustworthy. Abu Bakr ibn Ishaq: he is Muhammad ibn Ishaq al-Saghani, and Shayban is Ibn 'Abd al-Rahman al-Nahwi.

Ahmad also recorded it (26393) from Al-Hasan ibn Musa al-Ashayyab, with this chain.
Ahmad also recorded it (25816) via the route of Yunus ibn 'Ubayd, from Al-Hasan, who said: A man said: I said to 'A'ishah: "How much water sufficed the Messenger of Allah (peace and blessings be upon him) for his major ritual bath from janabah?" She said: So she called for a vessel which I estimated to be a sa' by your sa' (measure).
See also the hadith preceding this one.