It is narrated from Sayyidah Umaymah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) used to urinate in a wooden bowl and then place it under his bed. One day he (peace and blessings be upon him) urinated and placed it under the bed. He (peace and blessings be upon him) came and intended to throw it (out), but the bowl was empty. He (peace and blessings be upon him) said to a woman named Barakah, who was the servant of Sayyidah Umm Habibah (may Allah be pleased with her) and had come from Abyssinia: "Where is the urine that was in this bowl?" She said: O Messenger of Allah, I drank it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13406