I met a man who had accompanied the Prophet ﷺ just as Abu Hurairah had accompanied him. He said, "The Messenger of Allah ﷺ forbade any of us from combing his hair every day or urinating in the place where he bathes."
حدثنا أحمد بن يونس حدثنا زهير عن داود بن عبد الله
لقيت رجلا صحب النبي ﷺ كما صحبه أبو هريرة قال نهى رسول الله ﷺ أن يمتشط أحدنا كل يوم أو يبول في مغتسله
[Its chain of transmission is sahih]. Nasai narrated it in the Book of Purification, Chapter on the Prohibition of Bathing with the Leftover Water of a Person in a State of Major Impurity, hadith no. 239, from the hadith of Dawud bin Abdullah, with the same chain.