Sahih al-Bukhari 1563
صحيح البخاري#1563SahihNarrated Marwan bin Al-Hakam:I saw `Uthman and `Ali. `Uthman used to forbid people to perform Hajj-at-Tamattu` and Hajj-al-Qiran (Hajj and `Umra together), and when `Ali saw (this act of `Uthman), he assumed Ihram for Hajj and `Umra together saying, "Labbaik for `Umra and Hajj," and said, "I will not leave the tradition of the Prophet (ﷺ) on the saying of somebody
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: 25:49