Ulu l-arham Verse
Ulu l-arḥām verse (Arabic: آیه اُولو الأرحام) refers to verse six of Sura al-Ahzab (Qur'an 33) and verse seventy five of Sura al-Anfal (Qur'an 8). These verses refer to Muslims inheriting from their true relatives.
Some believe that before the revelation of Ulu l-arham verse, Muslims who entered Pact of Brotherhood with each other inherited from each other based on a temporary ruling given by the Prophet (s). But, after the revelation of this verse, that ruling was abrogated and the inheritance of Muslims from each other was limited to their true relatives.
According to some hadiths, inheritance in this verse is interpreted as wilaya and government as it is transmitted from Imam al-Baqir (a) that here inheritance refers to the wilaya of the progeny of Imam al-Husayn (a).
Text of the Verse
النَّبِيُّ أَوْلَىٰ بِالْمُؤْمِنِينَ مِنْ أَنفُسِهِمْ ۖ وَأَزْوَاجُهُ أُمَّهَاتُهُمْ ۗ وَأُولُو الْأَرْحَامِ بَعْضُهُمْ أَوْلَىٰ بِبَعْضٍ فِي كِتَابِ اللَّـهِ مِنَ الْمُؤْمِنِينَ وَالْمُهَاجِرِينَ إِلَّا أَن تَفْعَلُوا إِلَىٰ أَوْلِيَائِكُم مَّعْرُوفًا ۚ كَانَ ذَٰلِكَ فِي الْكِتَابِ مَسْطُورًا
The Prophet is closer to the faithful than their own souls, and his wives are their mothers. The blood relatives are more entitled to inherit from one another in the Book of Allah than the [other] faithful and Emigrants, barring any favour you may do your comrades. This has been written in the Book.