Sahih al-Bukhari Vol. 9, Book of Oneness of Allah, Hadith 483
Narrated Sufyan:
(regarding the above narration) that the Prophet added, "You are the Truth, and Your Word is the Truth."
Classification
Sahih (Authentic)
References
Sahih al-Bukhari Vol. 9, Book of Oneness of Allah, Hadith 483