Mishkat al-Masabih #438

Al-Hakam b. ‘Amr said that God’s messenger forbade that a man should perform ablution with the water left over by his wife after purifying herself. Abu Dawud, Ibn Majah and Tirmidhi transmitted it. Tirmidhi adding “Or he said, “With her leavings’.” He said that this is a hasan sahih tradition.