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."  

{ 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 }  

"To those also, to whom your right hand was pledged, give your portion." When the Emigrants came to Medina. they inherited from the Helpers without any blood-relationship with them for the brotherhood which the Messenger of Allah ﷺ established between them. When the following verse was revealed: "To (benefit) everyone we have appointed shares and heirs to property left by parent and relatives." it abrogated the verse: "To those also, to whom your right hand was pledged, give their due portion." This alliance was made for help, well wishing and cooperation. Now a legacy can be made for him. (The right to)inheritance was abolished.  

فِي قَوْلِهِ { وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ فَآتُوهُمْ نَصِيبَهُمْ } قَالَ كَانَ الْمُهَاجِرُونَ حِينَ قَدِمُوا الْمَدِينَةَ تُوَرِّثُ الأَنْصَارَ دُونَ ذَوِي رَحِمِهِ لِلأُخُوَّةِ الَّتِي آخَى رَسُولُ اللَّهِ ﷺ بَيْنَهُمْ فَلَمَّا نَزَلَتْ هَذِهِ الآيَةُ { وَلِكُلٍّ جَعَلْنَا مَوَالِيَ مِمَّا تَرَكَ } قَالَ نَسَخَتْهَا { وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ فَآتُوهُمْ نَصِيبَهُمْ } مِنَ النُّصْرَةِ وَالنَّصِيحَةِ وَالرِّفَادَةِ وَيُوصِي لَهُ وَقَدْ ذَهَبَ الْمِيرَاثُ  

I used to learn the reading of the Qur'an from Umm Sa'd, daughter of al-Rabi'. She was an orphan in the guardianship of Abu Bakr. I read the Qur'anic verse "To those also to whom your right hand was pledged." She said: Do not read the verse; "To those also to whom your right hand was pledged." This was revealed about Abu Bakr and his son 'Abd al-Rahman when he refused to accept Islam. Abu Bakr took an oath that he would not give him a share from inheritance. When he embraced Islam Allah Most High commanded His Prophet ﷺ to give him the share. The narrator 'Abd al-Aziz added: He did not accept Islam until he was urged on Islam by sword. Abu Dawud said: He who narrated the word 'aqadat means a pact ; and he who narrated the word 'aaqadat means the party who made a pact. The correct is the tradition of Talhah ('aaqadat).  

كُنْتُ أَقْرَأُ عَلَى أُمِّ سَعْدٍ بِنْتِ الرَّبِيعِ وَكَانَتْ يَتِيمَةً فِي حِجْرِ أَبِي بَكْرٍ فَقَرَأْتُ { وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ } فَقَالَتْ لاَ تَقْرَأْ { وَالَّذِينَ عَاقَدَتْ أَيْمَانُكُمْ } وَلَكِنْ { وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ } إِنَّمَا نَزَلَتْ فِي أَبِي بَكْرٍ وَابْنِهِ عَبْدِ الرَّحْمَنِ حِينَ أَبَى الإِسْلاَمَ فَحَلَفَ أَبُو بَكْرٍ أَلاَّ يُوَرِّثَهُ فَلَمَّا أَسْلَمَ أَمَرَ اللَّهُ تَعَالَى نَبِيَّهُ عَلَيْهِ السَّلاَمُ أَنْ يُؤْتِيَهُ نَصِيبَهُ زَادَ عَبْدُ الْعَزِيزِ فَمَا أَسْلَمَ حَتَّى حُمِلَ عَلَى الإِسْلاَمِ بِالسَّيْفِ  

Referring to the verse: "Those who believed and adopted exile... As to those who believed but came not into exile": A bedouin (who did not migrate to Medina) did not inherit from an emigrant, and an emigrant did no inherit from him. It was abrogated by the verse: "But kindred by blood have prior rights against each other."  

{ وَأُولُو الأَرْحَامِ بَعْضُهُمْ أَوْلَى بِبَعْضٍ }