Sunan an-Nasa'i 3478
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."
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَجُلاً، مِنْ بَنِي فَزَارَةَ أَتَى رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ إِنَّ امْرَأَتِي وَلَدَتْ غُلاَمًا أَسْوَدَ ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ هَلْ لَكَ مِنْ إِبِلٍ ‏"‏ ‏.‏ قَالَ نَعَمْ ‏.‏ قَالَ ‏"‏ فَمَا أَلْوَانُهَا ‏"‏ ‏.‏ قَالَ حُمْرٌ ‏.‏ قَالَ ‏"‏ فَهَلْ فِيهَا مِنْ أَوْرَقَ ‏"‏ ‏.‏ قَالَ إِنَّ فِيهَا لَوُرْقًا ‏.‏ قَالَ ‏"‏ فَأَنَّى تَرَى أَتَى ذَلِكَ ‏"‏ ‏.‏ قَالَ عَسَى أَنْ يَكُونَ نَزَعَهُ عِرْقٌ ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ وَهَذَا عَسَى أَنْ يَكُونَ نَزَعَهُ عِرْقٌ ‏"‏ ‏.‏