Sunan Ibn Majah 340
سنن ابن ماجه#340SahihIt was narrated that 'Abdullah bin Ja'far said:"The thing that the Prophet most liked to conceal himself behind when relieving himself was a hillock or a stand of date-palm trees
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 1:74