It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: The Messenger of Allah (peace and blessings be upon him) and I used to take the ritual bath (ghusl) from one vessel, and I would say to him: Leave some for me, leave some for me.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20170