Sunan Abi Dawud 5122
سنن أبي داود#5122SahihAbu Musa reported the Messenger of Allah (May peace be upon him) as saying:the son of a sister of a people belongs to them
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih
In-book reference: 43:350