Mishkat al-Masabih #2927
Inheritance and Wills
Kathir b. ‘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.
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About Mishkat al-Masabih
This hadith is #2927 from Mishkat al-Masabih, in the Book of Inheritance and Wills. Mishkat al-Masabih contains 4,428 hadiths across 25 books.