Narrated Ibn 'Abbas:
To those also, to whom your right hand was pledged, give their due portion. A man made an agreement with another man (in early days of Islam), and there was no relationship between the ; one of them inherited from the other. The following verse of Surat Al-Anfal abrogated it: "But kindred by blood have prior right against each other."

حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ ثَابِتٍ، حَدَّثَنِي عَلِيُّ بْنُ حُسَيْنٍ، عَنْ أَبِيهِ، عَنْ يَزِيدَ النَّحْوِيِّ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، رضى الله عنهما قَالَ { وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ فَآتُوهُمْ نَصِيبَهُمْ } كَانَ الرَّجُلُ يُحَالِفُ الرَّجُلَ لَيْسَ بَيْنَهُمَا نَسَبٌ فَيَرِثُ أَحَدُهُمَا الآخَرَ فَنَسَخَ ذَلِكَ الأَنْفَالُ فَقَالَ تَعَالَى { وَأُولُو الأَرْحَامِ بَعْضُهُمْ أَوْلَى بِبَعْضٍ } .