"I heard Abu Salamah say: 'I entered upon 'Aishah and her foster-brother was with her. He asked her about the Ghusl of the Prophet (ﷺ). She called for a vessel in which was a Sa' of water, then she concealed herself and performed Ghusl and poured water over her head three times.'"
Sunan an-Nasa'i Book 1, Hadith 228
← Previous Hadith "A vessel was brought to Mujahid, which I estimated to be eight Ratls, and he said: 'Aishah told me that the Messenger of Allah (ﷺ) used to perform Ghusl using such a vessel.'"

Sunan an-Nasa'i Book 1, Hadith 227 Next Hadith → "The Messenger of Allah (ﷺ) used to perform Ghusl from a vessel which was the size of a Faraq and he and I used to perform Ghusl using a single vessel." Sixteen Ratls.

Sunan an-Nasa'i Book 1, Hadith 229