Sahih al-Bukhari 4914
صحيح البخاري#4914SahihNarrated Ibn `Abbas:I intended to ask `Umar so I said, "Who were those two ladies who tried to back each other against the Prophet?" I hardly finished my speech when he said, They were `Aisha and Hafsa
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: 65:434