Sunan Ibn Majah The Book of Purification and its Sunnah al-Fadl bin Dakayn, Abu Na'eem الفضل بن دكين أبو نعيم الملائي Ali bin Muhammad bin Ishaq al-Tanafasi علي بن محمد بن إسحاق الطنافسي Isa bin Yzdad عيسى بن يزداد Muhammad bin Yahya bin Hiban محمد بن يحيى بن حبان Waki' bin al-Jarrah وكيع بن الجراح Zm'h bin Salah زمعة بن صالح “The Messenger of Allah said: ‘No one of you should bathe in open land or on a roof where he is not concealed; even if he does not see anyone, he can still be seen.'” https://parallelquran.com/hadith/sunan-ibn-majah-349/