Sunan Ibn Majah 615
سنن ابن ماجه#615Da'ifIt was narrated that 'Abdullah bin Mas'ud said:"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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniVery Daif
Muhammad Fouad Abd al-BaqiVery Daif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 1:349