Sünen-i Ebû Dâvûd — Prayer (Kitab Al-Salat): Detailed Rules of Law about the Prayer during Journey — Hadis No: 1198

Abu al-Tayyah reported on the authority of a shaykh (an old man):When Abdullah ibn Abbas came to Basrah, people narrated to him traditions from AbuMusa. Therefore Ibn Abbas wrote to him asking him about certain things. In reply AbuMusa wrote to him saying: One day I was in the company of the Messenger of Allah (ﷺ). He wanted to urinate. Then he came to a soft ground at the foot of a wall and urinated. He (the Prophet) then said: If any of you wants to urinate, he should look for a place (like this) for his urination

Narrated Ibn 'Abbas : The Prophet (sal Allaahu alayhi wa sallam ) passed by two graves. He said : Both (the dead) are being punished, but they are not being punished for a major (sin). One did not safeguard himself from urine. The other carried tales. He then called for a fresh twig and split it into two parts and planted one part on each grave and said: Perhaps their punishment may be mitigated as long as the twigs remain fresh. Another version of Hannad has: "One of them did not cover himself while urinating." This version does not have the words: "He did not safeguard himself from urine

Narrated 'Abd Allaah b. 'Umar :I ascended the roof of the house and saw the Apostle of Allaah ( sal Allaahu alayhi wa sallam) sitting on two bricks facing Jerusalem (Bait al-Maqdis) for relieving himself

Another tradition on the authority of Anas has:" O Allaah, I seek refuge in Thee." Shu'bah said: Anas sometimes reported the words: "I take refuge in Allah