It is narrated from Sayyidah Aishah (may Allah be pleased with her): The Messenger of Allah (peace and blessings be upon him) and I used to bathe from a single vessel that was between me and him (peace and blessings be upon him). He (peace and blessings be upon him) would hurry ahead of me (in taking water), until I would say: "Leave some for me, leave some for me," and we were both junub.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 893