Sunan An-Nasa'i

It was narrated from Abu Hurairah that a man from Banu Fazarah came to the Messenger of Allah and said:""My wife has given birth to a black boy."" The Messenger of Allah said: ""Do you have camels?"" He said: ""Yes."" He said: ""What color are they?"" He said: ""Red."" He said: ""Are there any gray ones among them?"" He said: ""There are some gray ones among them."" He said: ""Where do you think they come from?"" He said: ""Perhaps it is hereditary."" He said: ""Likewise, perhaps this is hereditary