Abu Huraira related that a certain man brought a black servant girl to the Prophet (SAW), and said: Oh Messenger of Allah, I am obliged to release a believing neck [i.e. slave]. So He said to her: Where is Allah? And she pointed to the sky with her finger. Then He said to her: And who am I? And she pointed to the Prophet (SAW) and to the sky, that is to say: You are the Messenger of Allah. And He said: Set her free; she is a believer.