Qasamah existed during the Jahiliyyah and the Messenger of Allah approved of it as it had been during the Jahiliyyah, and he ruled accordingly among some of the Ansar concerning a victim whom they claimed the Jews of Khaibar had Killed. (Sahih) Ma'mar contradicted the two of them.  

عَنْ أُنَاسٍ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ أَنَّ الْقَسَامَةَ كَانَتْ فِي الْجَاهِلِيَّةِ فَأَقَرَّهَا رَسُولُ اللَّهِ ﷺ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ وَقَضَى بِهَا بَيْنَ أُنَاسٍ مِنَ الأَنْصَارِ فِي قَتِيلٍ ادَّعَوْهُ عَلَى يَهُودِ خَيْبَرَ خَالَفَهُمَا مَعْمَرٌ  

Qasamah existed during the Jahiliyyah and the Messenger of Allah approved of it as it had been during the Jahiliyyah, and he ruled accordingly among some of the Ansar concerning a victim whom they claimed the Jews of Khaibar had Killed. (Sahih) Ma'mar contradicted the two of them. (Using translation from Nasāʾī 4708)   

عَنْ إِنْسَانٍ مِنَ الْأَنْصَارِ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّ الْقَسَامَةَ كَانَتْ فِي الْجَاهِلِيَّةِ قَسَامَةَ الدَّمِ فَأَقَرَّهَا رَسُولُ اللهِ ﷺ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ وَقَضَى بِهَا رَسُولُ اللهِ ﷺ بَيْنَ أُنَاسٍ مِنَ الْأَنْصَارِ مِنْ بَنِي حَارِثَةَ ادَّعُوهُ عَلَى الْيَهُودِ  

Qasamah existed during the Jahiliyyah and the Messenger of Allah approved of it as it had been during the Jahiliyyah, and he ruled accordingly among some of the Ansar concerning a victim whom they claimed the Jews of Khaibar had Killed. (Sahih) Ma'mar contradicted the two of them. (Using translation from Nasāʾī 4708)   

عَنْ إِنْسَانٍ مِنَ الْأَنْصَارِ مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ أَنَّ الْقَسَامَةَ كَانَتْ فِي الْجَاهِلِيَّةِ قَسَامَةُ الدَّمِ فَأَقَرَّهَا رَسُولُ اللهِ ﷺ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ وَقَضَى بِهَا رَسُولُ اللهِ ﷺ بَيْنَ أُنَاسٍ مِنَ الْأَنْصَارِ مِنْ بَنِي حَارِثَةَ فِي دَمٍ ادَّعَوْهُ عَلَى الْيَهُودِ  

[Machine] From some of the companions of the Messenger of Allah ﷺ , it was narrated that the Qasamah existed during the era of Ignorance, and it was a form of blood revenge. So the Messenger of Allah ﷺ affirmed it as it was in the era of Ignorance, and he resolved a dispute between some Ansar men from the tribe of Bani Harithah who accused the Jews. This was narrated by Yahya bin Ayoub from Aqeel and others.  

عَنْ أُنَاسٍ مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ أَنَّ الْقَسَامَةَ كَانَتْ فِي الْجَاهِلِيَّةِ قَسَامَةَ الدَّمِ فَأَقَرَّهَا رَسُولُ اللهِ ﷺ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ وَقَضَى بِهَا رَسُولُ اللهِ ﷺ بَيْنَ أُنَاسٍ مِنَ الْأَنْصَارِ مِنْ بَنِي حَارِثَةَ ادَّعَوْا عَلَى الْيَهُودِ وَرَوَاهُ يَحْيَى بْنُ أَيُّوبَ عَنْ عَقِيلٍ وَغَيْرِهِ