Sahih al-Bukhari 4708
صحيح البخاري#4708SahihNarrated Ibn Mas`ud:Surat Bani Israel and Al-Kahf and Mary are among my first old property
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: 65:230