A desert Arab came to Messenger of Allah ﷺ and said: My wife has given birth to a dark-complexioned child and I have disowned him. Thereupon Allah's Apostle ﷺ said: Have you any camels? He said: Yes. He said: What is their colour? He said? They are red. He said: Is there anyone dusky among them? He said: Yes. Messenger of Allah ﷺ said: How has it come about? He said: Messenger of Allah, it is perhaps due to the strain to which it has reverted, whereupon the Prophet ﷺ said: It (the birth) of the black child may be due to the strain to which he (the child) might have reverted.
يَا رَسُولَ اللَّهِ إِنَّ امْرَأَتِي وَلَدَتْ غُلاَمًا أَسْوَدَ وَإِنِّي أَنْكَرْتُهُ فَقَالَ لَهُ النَّبِيُّ ﷺ هَلْ لَكَ مِنْ إِبِلٍ قَالَ نَعَمْ قَالَ مَا أَلْوَانُهَا قَالَ حُمْرٌ قَالَ فَهَلْ فِيهَا مِنْ أَوْرَقَ قَالَ نَعَمْ قَالَ رَسُولُ اللَّهِ ﷺ فَأَنَّى هُوَ قَالَ لَعَلَّهُ يَا رَسُولَ اللَّهِ يَكُونُ نَزَعَهُ عِرْقٌ لَهُ فَقَالَ لَهُ النَّبِيُّ ﷺ وَهَذَا لَعَلَّهُ يَكُونُ نَزَعَهُ عِرْقٌ لَهُ