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