Sunan Ibn Majah Book 1, Hadith 106

the Prophet performed ablution with the water left over after she had taken a bath to cleanse herself from sexual impurity.

Previous Hadith

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."

Sunan Ibn Majah Book 1, Hadith 105
Next Hadith

The Messenger of Allah forbade men to perform ablution with the left over water by a woman.

Sunan Ibn Majah Book 1, Hadith 107