Sahih Muslim 6276
صحيح مسلم#6276SahihA'isha reported that Allah's Messenger (may peace he upon him) gave glad tidings to Khadija bint Khuwailid of a palace in Paradise
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 44:106