Sahih al-Bukhari 2876
صحيح البخاري#2876SahihNarrated `Aisha:the mother of the faithful believers: The Prophet (ﷺ) was asked by his wives about Jihad and he replied, "The best Jihad (for you) is (the performance of) Hajj
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: 56:92