There came a person to the Prophet (may peace he upon him) ) from Banu Fazara and said: My wife has given birth to a child who is black, whereupon Allah's Apostle ﷺ said: Have you any camels? He said: Yes. He again said: What is this colour? He said: They are red. He said: Is there a dusky one among them? He said: Yes, there are dusky ones among them He said: How has it come about? He said: It is perhaps the strain to which it has reverted, whereupon he (the Holy Prophet) said: It is perhaps the strain to which he (the child) has reverted. (Using translation from Muslim 1500a)
أَنَّ رَجُلًا مِنْ بَنِي فَزَارَةَ أَتَى رَسُولَ اللهِ ﷺ فَقَالَ إِنَّ امْرَأَتِي وَلَدَتْ غُلَامًا أَسْوَدَ فَقَالَ رَسُولُ اللهِ ﷺ «هَلْ لَكَ مِنْ إِبِلٍ؟» قَالَ نَعَمْ قَالَ «فَمَا أَلْوَانُهَا؟» قَالَ حُمْرٌ قَالَ «هَلْ فِيهَا مِنْ أَوْرَقَ؟» قَالَ إِنَّ فِيهَا لَوُرْقًا قَالَ «فَأَنَّى تَرَاهُ أَتَى ذَلِكَ؟» قَالَ عَسَى أَنْ يَكُونَ نَزَعَهُ عِرْقٌ فَقَالَ رَسُولُ اللهِ ﷺ «وَهَذَا عَسَى أَنْ يَكُونَ نَزَعَهُ عِرْقٌ»