"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. (Using translation from Abū Dāʾūd 2922)   

فِي قَوْلِهِ تَعَالَى {وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ فَآتُوهُمْ نَصِيبَهُمْ} [النساء 33] قَالَ كَانَ الْمُهَاجِرُونَ حِينَ قَدِمُوا الْمَدِينَةَ تُورِثُ الْأَنْصَارَ دُونَ رَحِمِهِ لِلْأُخُوَّةِ الَّتِي آخَى رَسُولُ اللهِ ﷺ بَيْنَهُمْ فَلَمَّا نَزَلَتْ {وَلِكُلٍّ جَعَلْنَا مَوَالِيَ مِمَّا تَرَكَ الْوَالِدَانِ وَالْأَقْرَبُونَ} [النساء 33] قَالَ نَسَخَتْهَا {وَالَّذِينَ عَقَدَتْ أَيْمَانُكُمْ فَآتُوهُمْ نَصِيبَهُمْ} [النساء 33] مِنَ النَّصْرِ وَالنَّصِيحَةِ وَالرِّفَادَةِ وَيُوصِي لَهُ وَقَدْ ذَهَبَ الْمِيرَاثُ  

The Messenger of Allah ﷺ as saying: There is no alliance in Islam, and Islam strengthened the alliance made during pre-Islamic days. (Using translation from Abū Dāʾūd 2925)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا حِلْفَ فِي الْإِسْلَامِ وَأَيُّمَا حِلْفٍ كَانَ فِي الْجَاهِلِيَّةِ فَإِنَّ الْإِسْلَامَ لَمْ يَزِدْهُ إِلَّا شِدَّةً»