It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that one of the wives of the Noble Prophet (peace and blessings be upon him) performed ghusl (ritual bath) of janabah, and then the Prophet (peace and blessings be upon him) performed wudu (ablution) with the leftover water from her bath. When she informed the Prophet (peace and blessings be upon him) of the whole matter, he said: "Indeed, nothing makes water impure."
Hadith Referenceالفتح الربانی / كتاب الطهارة / 385