Narrated Sahl bin Sa`d: The most beloved names to `Ali was Abu Turab, and he used to be pleased when we called him by it, for none named him Abu Turab (for the first time), but the Prophet. Once `Ali got angry with (his wife) Fatima, and went out (of his house) and slept near a wall in the mosque. The Prophet came searching for him, and someone said, He is there, Lying near the wall. The Prophet came to him while his (`Ali's) back was covered with dust. The Prophet started removing the dust from his back, saying, Get up, O Abu Turab!