Sahih al-Bukhari 5293
صحيح البخاري#5293SahihNarrated Ibn `Abbas:Allah's Messenger (ﷺ) performed the Tawaf (around the Ka`ba while riding his camel, and every time he reached the corner (of the Black Stone) he pointed at it with his hand and said, "Allahu Akbar." (Zainab said: The Prophet (ﷺ) said, "An opening has been made in the wall of Gog and Magog like this and this," forming the number 90 (with his thumb and index finger)
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: 68:42