Musannaf Ibn Abi Shayba 1:790

Hammad bin Khalid narrated to us, from al-Husam bin Misak (Mufaddal), from Abu Ma'shar, from Ibrahim, who said: A man asked about Abu Hurayrah regarding a hadith of his. He said: "I perform ghusl, and [water] returns from my body into my vessel." He said: "There is no harm in it."