Sahih Muslim
The Book Pertaining to the Rules of Inheritance (Kitab Al-Faraid)
Book Number: 011 / Hadith Number: 3940
Abu Ishaq said that he heard al-Bara' b. 'Azib (Allah be pleased with him say: The last verse revealed (in the Holy Quran) is that pertaining to Kalala, and the last sura revealed is Sura al-Bara'at.