Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) went off to relieve himself and said: "Bring me something, and do not bring me near a bone or dung." I did so, and he (peace and blessings be upon him) performed ablution, then prayed.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9923