Sayyidah Umm Salamah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) and I used to take the ritual bath for major ritual impurity (ghusl al-janabah) from a single vessel.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 903