Sunan Ibn Majah 2003
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."
حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا عَبَاءَةُ بْنُ كُلَيْبٍ اللَّيْثِيُّ أَبُو غَسَّانَ، عَنْ جُوَيْرِيَةَ بْنِ أَسْمَاءَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، ‏.‏ أَنَّ رَجُلاً، مِنْ أَهْلِ الْبَادِيَةِ أَتَى النَّبِيَّ ـ صلى الله عليه وسلم ـ فَقَالَ يَا رَسُولَ اللَّهِ إِنَّ امْرَأَتِي وَلَدَتْ عَلَى فِرَاشِي غُلاَمًا أَسْوَدَ وَإِنَّا أَهْلُ بَيْتٍ لَمْ يَكُنْ فِينَا أَسْوَدُ قَطُّ ‏.‏ قَالَ ‏"‏ هَلْ لَكَ مِنَ إِبِلٍ ‏"‏ ‏.‏ قَالَ نَعَمْ ‏.‏ قَالَ ‏"‏ فَمَا أَلْوَانُهَا ‏"‏ ‏.‏ قَالَ حُمْرٌ ‏.‏ قَالَ ‏"‏ هَلْ فِيهَا أَسْوَدُ ‏"‏ ‏.‏ قَالَ لاَ ‏.‏ قَالَ ‏"‏ فَهَلْ فِيهَا أَوْرَقُ ‏"‏ ‏.‏ قَالَ نَعَمْ ‏.‏ قَالَ ‏"‏ فَأَنَّى كَانَ ذَلِكَ ‏"‏ ‏.‏ قَالَ عَسَى أَنْ يَكُونَ نَزَعَهُ عِرْقٌ ‏.‏ قَالَ ‏"‏ فَلَعَلَّ ابْنَكَ هَذَا نَزَعَهُ عِرْقٌ ‏"‏ ‏.‏