Sulaiman b. Yasar, the freed slave of Maimuna, the wife of Allah's Apostle ﷺ, narrated from one of the Ansari Companions of Messenger of Allah ﷺ that Messenger of Allah ﷺ retained (the practice) of Qasama as it was in the pre-Islamic days.

أَخْبَرَنِي أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ وَسُلَيْمَانُ بْنُ يَسَارٍ مَوْلَى مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ عَنْ رَجُلٍ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ مِنَ الأَنْصَارِ أَنَّ رَسُولَ اللَّهِ ﷺ أَقَرَّ الْقَسَامَةَ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ

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

[AI] From some of the companions of the Prophet ﷺ from the Ansar, it is narrated that the Messenger of Allah ﷺ confirmed her (i.e. a woman) on what she was upon during the pre-Islamic era and ruled by her when some of the Ansar disputed regarding a killing they claimed against the Jews.

عَنْ رِجَالٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ مِنَ الْأَنْصَارِ أَنَّ رَسُولَ اللهِ ﷺ أَقَرَّهَا عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ وَقَضَى بِهَا بَيْنَ نَاسٍ مِنَ الْأَنْصَارِ فِي قَتِيلٍ ادَّعَوْهُ عَلَى الْيَهُودِ

the Messenger or Allah approved of Qasamah as it had been during the Jahiliyyah. (Using translation from Nasāʾī 4707)

عَنْ رَجُلٍ مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ مِنَ الْأَنْصَارِ أَنَّ رَسُولَ اللهِ ﷺ «أَقَرَّ الْقَسَامَةَ عَلَى مَا كَانَتْ عَلَيْهِ فِي الْجَاهِلِيَّةِ» وَاللَّفْظُ لِأَحْمَدَ

[AI] 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