‘A'isha said, “God’s messenger used his right hand for his ablution water and his food, and his left hand for his evacuations and anything objectionable.”
Abu Huraira reported God’s messenger as saying, "I am to you just like a father to his son, for I give you instruction. When you go to relieve yourselves do not face or turn your back to the qibla.” He commanded that three stones be used, he forbade the use of dung and decayed bones, and he forbade that a man should cleanse himself with his right hand.
She also reported God’s messenger as saying, “When one of you goes to relieve himself he should take with him three stones with which to cleanse himself, for they will be enough for him.”
Ahmad, Abu Dawud, Nasa’i and Darimi transmitted it.