A man from the tribe of Banu Fazarah came to the Messenger of Allah ﷺ and said, "My wife has given birth to a black boy."The Messenger of Allah ﷺ asked him, "Do you have any camels?"He replied, "Yes."The Prophet asked, "What are their colors?"He said, "Red."The Prophet asked, "Is there a dusky one among them?"He answered, "Yes, there are some dusky ones."The Prophet asked, "How do you suppose that came about?"He said, "Perhaps it was drawn out by some ancestral strain."The Messenger of Allah ﷺ said, "And this child too, perhaps an ancestral strain has drawn out his color."
أخبرنا إسحق بن إبراهيم قال أنبأنا سفيان عن الزهري عن سعيد بن المسيب
أن رجلا من بني فزارة أتى رسول الله ﷺ فقال إن امرأتي ولدت غلاما أسود فقال رسول الله ﷺ هل لك من إبل قال نعم قال فما ألوانها قال حمر قال فهل فيها من أورق قال إن فيها لورقا قال فأنى ترى أتى ذلك قال عسى أن يكون نزعه عرق فقال رسول الله ﷺ وهذا عسى أن يكون نزعه عرق
Muslim narrated it in the chapter on li'an, hadith no. 18/1500, from the hadith of Sufyan bin Uyayna, through this route. It is also in Kubra, hadith no. 5672.