It wasnarrated from 'Ali that the Messenger of Allah (ﷺ) said:
"WhenI die, then wash me with seven buckets from me well, the well ofGhars." (RU)
English reference (RU): Vol. 1, Book 6, Hadith 1468 (RU)
Arabic reference (RU): Book 6, Hadith 1535 (RU)