وَعَنْ كَثِيرِ بْنِ عَبْدِ اللَّهِ عَنْ أَبِيهِ عَنْ جَدِّهِ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَوْلَى الْقَوْمِ مِنْهُمْ وَحَلِيفُ الْقَوْمِ مِنْهُمْ وَابْنُ أُخْتِ الْقَوْمِ مِنْهُمْ»
Kathir ibn Abdallah, on his father’s authority, said that his grand-father reported God’s Messenger as saying, “The freedman of a people is one of them, the ally* of a people is one of them, and a sister’s son has blood-relationship to her family.” * Or “close friend”. Dawud transmitted it.
Mishkat al-Masabih 2928, Book 13, Inheritance and Wills, Hadith 10. 1 min read