Sayyidah Umaymah bint Ruqayqah (may Allah be pleased with her) said: The Prophet (peace and blessings be upon him) used to urinate in a wooden bowl, which would then be placed under his bed. (Once) he (peace and blessings be upon him) urinated in it, and when he came back and wanted it, there was nothing in the bowl. So he (peace and blessings be upon him) said to a woman named Barakah, who was the servant of Umm Habibah (may Allah be pleased with her) and whom she had brought with her from the land of Abyssinia: "Where is the urine that was in the bowl?" She said: I drank it. So he (peace and blessings be upon him) said: "You have built for yourself a strong barrier against the Fire."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20848