It was narrated from Ibn 'Umar that:
a man frorn the desert people came to the Prophet and said: O Messenger of Allah, my wife has given birth on my bed to a black boy, and there are no black people among my family. He said: Do you have camels? He said: Yes. He said: What color are they? He said: Red. He said: are there any black ones among them? He said, No. He said: Are there any grey ones among them? He said- Yes. He said How is that? He said: Perhaps it is hereditary. He said: Perhaps (the color of) this son of yours is also hereditary.