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 us to comb our hair every day, or to urinate in the place where we bathe."
لقيت رجلا صحب النبي ﷺ كما صحبه أبو هريرة قال: نهى رسول الله ﷺ أن يمتشط أحدنا كل يوم، أو يبول في مغتسله.
Narrated by Abu Dawud (28), and this is his wording, and Nasai (238), and Ahmad (17011), all of them through the route of Dawud bin Abdullah Awdi, from Humayd Himyari, who related it. Its chain of transmission is sahih.Similar in meaning is what was narrated from Abdullah bin Mughafal, who said, the Messenger of Allah ﷺ said, "None of you should urinate in the place where he washes and then bathe in it, for most obsessive thoughts come from that." Narrated by Abu Dawud (27), Tirmidhi (21), Nasai (36), Ibn Majah (304), Ibn Hibban (1255), and Hakim (1/167), all of them through the route of Ashath bin Abdullah, from Hasan, from Abdullah bin Mughafal, from the Prophet ﷺ, who related it.Tirmidhi said, "This is a gharib hadith. We do not know it as a raised (marfu) narration except through the hadith of Ashath bin Abdullah." And it is as he said. Shuba narrated it from Qatada, that he heard Uqba bin Sahban, from Abdullah bin Mughafal, that he was asked about a man who urinates in his washing place, and he said, obsessive thoughts are to be feared from that. Bayhaqi narrated it (1/98) with his chain from Shuba as a stopped (mawquf) narration.I say, this is closer to being correct, just as in the first chain there is Hasan, who is the well known imam Basri, a mudallis, and he did not state explicitly that he heard it directly, even though the scholars have affirmed that he did hear from Abdullah bin Mughafal.His statement, "mustaham" (washing place) comes from "hameem," which means hot water.Ibn Majah said, "I heard Ali bin Muhammad Tanafisi say, this only applies to a pit dug in the ground, but nowadays it does not apply, since their washing places are made of gypsum, mortar, and tar, so if one urinates and then pours water over it, there is no harm in that." And "sarooj" is lime and its mixtures with which basins and bathhouses are plastered.