Sahih al-Bukhari 3868
صحيح البخاري#3868SahihNarrated Anas bin Malik:The people of Mecca asked Allah's Messenger (ﷺ) to show them a miracle. So he showed them the moon split in two halves between which they saw the Hira' mountain
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: 63:93