´It was narrated from Ibn 'Abbas that:` One of the wives of the Prophet took a bath to cleanse herself from sexual impurity, then the Prophet performed ablution and had a bath with the water left over from her ablution."
Hadith ReferenceSunan Ibn Majah / The Book of Purification and its Sunnah / Hadith: 371
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف, ضعيف, انظر الحديث السابق (370), انوار الصحيفه، صفحه نمبر 391