Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: A Bedouin came to the Messenger of Allah (peace and blessings be upon him) and said: My wife has given birth to a black child. He (peace and blessings be upon him) asked: "Do you have camels?" He said: Yes. He (peace and blessings be upon him) asked: "What are their colours?" He said: Red. He (peace and blessings be upon him) asked: "Is there an ash-coloured one among them?" He said: Yes. He (peace and blessings be upon him) said: "Why is that?" He said: Perhaps some strain (of ancestry) drew it. The Messenger of Allah (peace and blessings be upon him) said: "Perhaps some strain drew him too."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14243