It was narrated from Abu Umamah bin Sahl bin Hunaif that a man shot an arrow at another man and killed him, and he had no heir except a maternal uncle. Abu 'Ubaidah bin al-Jarrah wrote to ‘Umar concerning that and he wrote back saying that the Prophet (ﷺ) ﷺ said:

`Allah and His Messenger are the guardians of the one who has no guardian, and the maternal uncle is the heir of the one who has no heir.”

حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْحَارِثِ بْنِ عَيَّاشِ بْنِ أَبِي رَبِيعَةَ، رَضِيَ اللَّهُ عَنْهُمْ عَنْ حَكِيمِ بْنِ حَكِيمِ بْنِ عَبَّادِ بْنِ حُنَيْفٍ، عَنْ أَبِي أُمَامَةَ بْنِ سَهْلِ بْنِ حُنَيْفٍ، أَنَّ رَجُلًا، رَمَى رَجُلًا بِسَهْمٍ فَقَتَلَهُ وَلَيْسَ لَهُ وَارِثٌ إِلَّا خَالٌ فَكَتَبَ فِي ذَلِكَ أَبُو عُبَيْدَةَ بْنُ الْجَرَّاحِ إِلَى عُمَرَ رَضِيَ اللَّهُ عَنْهُ فَكَتَبَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ اللَّهُ وَرَسُولُهُ مَوْلَى مَنْ لَا مَوْلَى لَهُ وَالْخَالُ وَارِثُ مَنْ لَا وَارِثَ لَهُ‏.‏