Sahih al-Bukhari 1879
صحيح البخاري#1879SahihNarrated Abu Bakra:The Prophet (ﷺ) said, "The terror caused by Al-Masih Ad-Dajjal will not enter Medina and at that time Medina will have seven gates and there will be two angels at each gate guarding them
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: 29:13