حَدَّثَنَا يَزِيدُ، أَنْبَأَنَا زَكَرِيَّا، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ إِنَّكُمْ تَقْرَءُونَ ‏{‏مِنْ بَعْدِ وَصِيَّةٍ يُوصَى بِهَا أَوْ دَيْنٍ‏}‏ وَإِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَضَى بِالدَّيْنِ قَبْلَ الْوَصِيَّةِ وَإِنَّ أَعْيَانَ بَنِي الْأُمِّ يَتَوَارَثُونَ دُونَ بَنِي الْعَلَّاتِ يَرِثُ الرَّجُلُ أَخَاهُ لِأَبِيهِ وَأُمِّهِ دُونَ أَخِيهِ لِأَبِيهِ‏.‏

You recite: `after the payment of legacies he may have bequeathed or debts` that sons from the same father and mother inherit from one another, but sons from different mothers (but the same father) do not. A man inherits from his brother through his father and mother but not from his brother through his father only.