Sahih al-Bukhari 3658
صحيح البخاري#3658SahihNarrated `Abdullah bin Abi Mulaika:The people of Kufa sent a letter to Ibn Az-Zubair, asking about (the inheritance of) (paternal) grandfather. He replied that the right of the inheritance of (paternal) grandfather is the same as that of father if the father is dead) and added, "Allah's Messenger (ﷺ) said, ' If I were to take a Khalil from this nation, I would have taken him (i.e. Abu Bakr)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 62:10