Abu Samh said:
"I used to serve the Prophet, and when he wanted to take a bath he would say: 'Turn your back to me.' So I would turn my back and hung up a cloth, and concealed him with it." (FR)
English reference (FR): Vol. 1, Book 1, Hadith 613 (FR)
Arabic reference (FR): Book 1, Hadith 656 (FR)