Sahih al-Bukhari 1345
صحيح البخاري#1345SahihNarrated Jabir bin `Abdullah:The Prophet (ﷺ) buried every two martyrs in of Uhud in one grave
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: 23:100