Humayd bin Abd al-Rahman al-Himyari said: I met a man who had been a Companion of the Prophet (peace and blessings be upon him), just as Abu Hurayrah (may Allah be pleased with him) had been, for four years. He said: the Messenger of Allah (peace and blessings be upon him) forbade combing the hair every day, urinating in one's bathing place, a woman bathing with the water left over by a man, or a man bathing with the water left over by a woman; rather, they should both scoop water together.
The narrators of this hadith are thiqat (trustworthy), except that Humayd did not name the Companion who narrated it to him, so it is in the sense of a mursal report; yet it would be a good mursal were it not that it contradicts the established, connected hadiths before it. And the two Shaykhs, Bukhari and Muslim (may Allah have mercy on them both), did not use Dawud bin Abdullah al-Awdi as evidence.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 913