It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that a man brought a black non-Arab slave girl to the Noble Prophet (peace and blessings be upon him) and said, "O Messenger of Allah (peace and blessings be upon him), it is obligatory upon me to free a Muslim slave (can I free her?)" The Noble Prophet (peace and blessings be upon him) asked the slave girl, "Where is Allah?" She pointed towards the sky with her index finger. Then the Noble Prophet (peace and blessings be upon him) asked her, "Who am I?" She pointed with her finger towards the Noble Prophet (peace and blessings be upon him) and towards the sky, meaning that you are the Messenger of Allah. The Noble Prophet (peace and blessings be upon him) said, "Free her."