Sunan At-Tirmidhi

Abu Hurairah narrated : ""that a man from [Banu] Fazarah came to the Prophet (ﷺ) and said: 'O Messenger of Allah (ﷺ)! My wife gave birth to black boy."" So the Prophet (s.a.w) said: ""[Do you have any camels?]"" He said: 'Yes."" He said: ""Then what are their colors?"" He said: ""Red."" He said: ""Is there a gray one among them?"" He said: ""Yes, there is a grey one among them."" He said: ""From where does that come?"" He said: ""Perhaps it is hereditary."" He said: ""Then in the same way, perhaps it is his heredity."" [Abu 'Eisa said:] This Hadith is Hasan Sahih