Sahih al-Bukhari 3771
صحيح البخاري#3771SahihNarrated Al-Qasim bin Muhammad:Once `Aisha became sick and Ibn `Abbas went to see her and said, "O mother of the believers! You are leaving for truthful fore-runners i.e. for Allah's Messenger (ﷺ) and 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: 62:116