Musnad Ahmad 183
Amr bin Shu'aib narrated, from his father, that his grandfather said:
When 'Amr came back, Banu Ma'mar came to him and they referred their dispute with him concerning the wala' of their sister to 'Umar. 'Umar ­رضي الله عنه said, I will judge between you according to what I heard from the Messenger of Allah ﷺ . I heard him say: “What the son or father acquires goes to his agnates, no matter who they are.” So he ruled in our favour,
حَدَّثَنَا يَحْيَى، حَدَّثَنَا حُسَيْنٌ الْمُعَلِّمُ، حَدَّثَنَا عَمْرُو بْنُ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ فَلَمَّا رَجَعَ عَمْرٌو جَاءَ بَنُو مَعْمَرِ بْنِ حَبِيبٍ يُخَاصِمُونَهُ فِي وَلَاءِ أُخْتِهِمْ إِلَى عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ فَقَالَ أَقْضِي بَيْنَكُمْ بِمَا سَمِعْتُ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ مَا أَحْرَزَ الْوَلَدُ أَوْ الْوَالِدُ فَهُوَ لِعَصَبَتِهِ مَنْ كَانَ فَقَضَى لَنَا بِهِ‏.‏