Sahih Muslim 4154
صحيح مسلم#4154SahihAbu Ishaq said that he heard al-Bara' b. 'Azib (Allah be pleased with him) say:The last complete sura revealed (in the Holy Qur'an) is Sura Tauba (i e. al-Bara'at, ix.), and the last verse revealed is that pertaining to Kalala
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 23:15