(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