Sunan Ibn Majah

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