The Prophet ﷺ and his wife used to bathe from a single vessel, and neither of them would bathe with what the other had left over.
حدثنا محمد بن يحيى حدثنا عبيد الله عن إسرائيل عن أبي إسحق عن الحارث
كان النبي ﷺ وأهله يغتسلون من إناء واحد ولا يغتسل أحدهما بفضل صاحبه
No references are available.
[Its chain of transmission is daif] Ahmad narrated it: 1/77, from the hadith of Israil, through the same route. See hadith 95 for the defect in it.