Sunan Ibn Majah 319
سنن ابن ماجه#319Da'ifIt was narrated that Ma'qil bin Abu Ma'qil Al-Asadi, who was a Companion of the Prophet, said:"The Messenger of Allah forbade us from facing either of the two Qiblah when defecating or urinating
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniDaif
Muhammad Fouad Abd al-BaqiDaif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 1:53