"The thing that the Prophet most liked to conceal himself behind when relieving himself was a hillock or a stand of date-palm trees."
Sunan Ibn Majah Book 1, Hadith 74
← Previous Hadith "I was with the Prophet on a journey, and he wanted to relieve himself. He said to me: 'Go to those two small date-palm trees and tell them: "The Messenger of Allah orders you to come together.'" So they came together and he concealed himself behind them, and relieved himself. Then he said to me: 'Go to them and tell them: "Go back, each one of you, to your places.'" So I said that to them and they went back."

Sunan Ibn Majah Book 1, Hadith 73 Next Hadith → "The Messenger of Allah turned towards a mountain pass and urinated, until I took pity on him because of the way he parted his legs when he urinated."

Sunan Ibn Majah Book 1, Hadith 75