Sahih Muslim
The Book Pertaining to the Rules of Inheritance (Kitab Al-Faraid)
Book Number: 011 / Hadith Number: 3941
Abu 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.