Sahih al-Bukhari 6910
Narrated Abu Huraira:
Two women from Hudhail fought with each other and one of them hit the other with a stone that 
killed her and what was in her womb. The relatives of the killer and the relatives of the victim 
submitted their case to the Prophet (ﷺ) who judged that the Diya for the fetus was a male or female slave, 
and the Diya for the killed woman was to be paid by the 'Asaba (near relatives) of the killer.
حَدَّثَنَا أَحْمَدُ بْنُ صَالِحٍ، حَدَّثَنَا ابْنُ وَهْبٍ، حَدَّثَنَا يُونُسُ، عَنِ ابْنِ شِهَابٍ، عَنِ ابْنِ الْمُسَيَّبِ، وَأَبِي، سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ أَنَّ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ اقْتَتَلَتِ امْرَأَتَانِ مِنْ هُذَيْلٍ، فَرَمَتْ إِحْدَاهُمَا الأُخْرَى بِحَجَرٍ قَتَلَتْهَا وَمَا فِي بَطْنِهَا، فَاخْتَصَمُوا إِلَى النَّبِيِّ صلى الله عليه وسلم فَقَضَى أَنَّ دِيَةَ جَنِينِهَا غُرَّةٌ عَبْدٌ أَوْ وَلِيدَةٌ، وَقَضَى دِيَةَ الْمَرْأَةِ عَلَى عَاقِلَتِهَا‏.‏